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Wethertex MP44 Exterior Wall Coating
When it comes to protecting your home’s exterior, Wethertex MP44 Exterior Wall Coating stands out as one of the most advanced and proven solutions available in the UK. Engineered using Pliolite® resin technology, this high-performance coating provides long-lasting protection against rain, frost, and UV degradation — all while maintaining full breathability.
Unlike standard masonry paint, Wethertex MP44 is a professional-grade system designed for deep adhesion, flexibility, and minimal maintenance. Homeowners and trade professionals alike choose it for its combination of strength, beauty, and longevity.
In this expert guide, we’ll answer the most commonly asked questions about Wethertex MP44 — from its composition and lifespan to cost, colour options, and where to buy. If you’re considering protecting your property with a professional wall coating, this will give you the technical insights and confidence you need.
Image Source: Wethertex.co.uk
1. What is Wethertex MP44 Exterior Wall Coating made of?
The Wethertex MP44 is formulated using Pliolite® resin technology, a solvent-based styrene-acrylic resin system designed specifically for heavy-duty exterior wall protection. According to Wethertex’s technical overview, Pliolite resin forms a microporous film that offers excellent adhesion, durability and weather resistance.
Here are the key composition / formulation details and what they mean in practice:
Solvent-based system (rather than purely water-borne), meaning smaller resin particle size, deeper substrate penetration and stronger adhesion.
Microporous film: the resin forms a film with pores smaller than those in typical masonry substrates, enabling vapour to pass out (i.e., breathable) while preventing ingress of wind-driven rain.
Highly polymer-modified: From the Technical Data Sheet, MP44 is described as “highly polymer modified, water-repellent” and suitable for low temperature application.
Additives / functional features: such as water-repellency modifiers, film-forming enhancement, pigmenting for colour stability and possibly anti-fungal treatment (depending on substrate prep). The SDS refers to hazard classifications (e.g., flammable vapour) thus highlighting the solvent-based nature.
Ancillaries: The MP44 system expects priming with Wethertex PP1 primer (or other suitable primer) and appropriate base coat or substrate preparation if required.
Why this matters: Understanding the composition helps buyers and specifiers appreciate why MP44 offers higher performance than typical masonry paints: deeper adhesion, better weather-proofing and longer lifespan. It also explains the application constraints (solvent-based, vapour/film formation, temperature/humidity dependencies).
Additional resources:
Wethertex MP44 Technical Data Sheet (PDF) for full formulation data. Wethertex
Wethertex article on Pliolite Resin Technology. Wethertex
2. How long does Wethertex MP44 last once applied?
Longevity is one of the major selling points of the MP44 system. According to Wethertex, the Pliolite resin systems (including MP44) have “been demonstrated to work effectively on properties for over 45 years”.
In practical terms:
The system is marketed as “long term protection & low maintenance”. Wethertex
Case studies show that surfaces protected with MP44 may not require major re-coating for decades.
Lifespan will depend on factors such as substrate condition, local exposure to weather (wind/rain/freeze-thaw), quality of application (prep, mix, spray technique), and maintenance of peripheral elements (e.g., flashings, trims, gutters).
Wethertex’s emphasis on “maintenance-free for many years” implies that while eventual re-coating may be necessary, the interval is significantly longer than with standard masonry paints.
Why this matters: For homeowners or contractors, the longer lifespan translates into lower lifetime cost, fewer disruptions and less repainting/re-rendering. That helps justify higher upfront cost or specialised application.
Additional resources:
Wethertex Performance Coatings section (overview of systems and lifespan).
3. Is Wethertex MP44 fully waterproof and breathable?
This question is central because many homeowners and specifiers expect both rain/wind protection and vapour permeability (so they avoid trapped moisture). The MP44 system is explicitly designed to meet both criteria.
Waterproof / water repellent:
The Technical Data Sheet states “water repellent” and “will not only fully waterproof your property and create a beautiful finished look”.
The Pliolite resin technology article describes how microporous film blocks wind-driven rain while still allowing vapour out.
Wethertex emphasises that their Performance Coatings (including MP44) are developed because “constant exposure to water, frost and sun… can seriously degrade traditional paint and render finishes”.
Breathable / vapour transmission:
The Pliolite article: “the pores in the film of our coatings are much smaller than the pores of a masonry substrate … meaning that the wind-driven rain is blocked. … the water vapour … can pass out through the film.”
The technical sheet for MP44 states it has “excellent adhesion and breathability properties”.
Important caveats / best practice:
Despite these claims, correct substrate preparation, suitable weather conditions and correct application are essential. For example, the MP44 TDS states application should not proceed if frost is forecast or substrate is too hot/humid.
Also, the waterproof nature applies to the wall coating film; it cannot overcome structural defects such as broken flashings, failed DPCs, or seriously saturated substrates. The buyer still needs to ensure the wall is sound, dry and free of defects.
Our before and afters highlight cleaning and prep of walls before application.
Why this matters: Understanding that MP44 offers both protection and breathability addresses a key trade-off in the market: many coatings protect but trap moisture (leading to blisters, damp). With MP44, you get both — but only if applied correctly.
Additional resources:
See Wethertex Pliolite Resin article for the science of impermeable / breathable.
Image Source: Wethertex.co.uk
4. Can Wethertex MP44 be applied over existing paint or render?
Residential and commercial property pwners want to know if they can refresh existing walls (e.g., old paint, rough-cast render, pebble-dash) with MP44 rather than full removal.
The answer is: YES, but with conditions.
What the manufacturer says:
The Technical Data Sheet (TDS) states: “On new, clean, dry, sound surfaces MP44 … can be applied directly to a suitably prepared substrate. For refurbishment projects, remove all loose and flaking materials. Make good cracks and structural defects. All surfaces must be reasonably dry and free from algae, lichen & other growths and grease.”
The TDS highlights the need to ensure substrate dryness and correct weather conditions: Avoid application if frost is forecast, or if substrate is hot or humidity is too high.
The Wethertex system also page mentions that MP44 is suitable for spray application to surfaces that are correctly primed and prepared.
Practical considerations:
If the existing paint is unstable (flaking, poorly adhered), it must be removed. Coating over defective paint will reduce the lifespan of the new coating.
For render: If it’s sound and well adhered, it may be suitable. If cracked, spalling, or moisture-damaged, these defects must be rectified first.
Surface contamination (moss, algae, dirt) should be removed by washing (power washing) and perhaps fungicidal treatment. The case study for Colwyn Bay confirms power wash and cleaning before application.
The substrate must be sufficiently dry. The TDS mentions avoid application if RH > 95% and cold temperatures (below –5°C) or heat above 25°C during application.
Priming: For surfaces with high suction or variable substrate, application of a primer (e.g., Wethertex PP1) may be required to ensure consistent film build.
Why this matters: It gives homeowners and contractors clarity on risk vs cost saving: you may be able to save on full strip-out, but you must invest in proper prep. Skipping prep could lead to premature failure and higher lifetime cost.
5. How is Wethertex MP44 applied — brush, roller, or spray?
Application method affects finish uniformity, cost, speed and final performance. For MP44, the manufacturer specifies spray application as the preferred method.
Manufacturer’s guidance:
The TDS indicates MP44 is “spray applied through coloured wall coating” and that finishing tool is “spray unit”.
The Wethertex product page lists “Suitable for Spray Application” as one of MP44’s benefits.
The application instructions: “To avoid dampness and discolouration application should be avoided below DPC or within 150 mm of ground level. Apply using suitable spray equipment. Spray gun tip should be held at a suitable distance… Use either horizontal or vertical motions and overlap on each pass of the gun by 30% to ensure even appearance.”
Key application steps:
Ensure substrate is clean, dry, prepared (remove flaking material, moss etc).
Priming if required (PP1 primer or other suitable) to ensure suction and key.
Mix the material: it is supplied ready to use but may need re-mixing with a paddle mixer. Do not reduce by more than 2% with S62 diluter.
Spray equipment: Use suitable spray gun / nozzle at correct distance, maintain a wet edge, avoid heavy overlaps, ensure uniform film build.
Weather/temperature constraints: Avoid substrate hot/damp; avoid direct bright sun or high wind that may cause uneven drying. The TDS warns of film damage, wash off or discolouration if conditions are not met.
After application: Clean equipment with white spirit; ensure first 24 hrs are protected from rain, frost, strong direct sun or wind.
Alternative methods:
While spray is primary, in some refurbishment projects conventional methods (roller/brush) might be used, but this risks uneven film thickness, lower performance or longer application time — and the manufacturer does not list roller/brush as standard for MP44.
Why this matters: Application method affects film uniformity, performance (water-repellency, breathability) and longevity. Correct application will help avoid early failure, patchy finish, or user dissatisfaction.
6. What surfaces can Wethertex MP44 be used on?
Image Source: Wethertex.co.uk
The suitability of substrate is critical for performance. According to the manufacturer, MP44 is suitable for a wide range of exterior masonry surfaces — subject to correct preparation and priming.
Manufacturer’s substrate guidance:
The TDS lists “Suitable Substrates: Suitable Wethertex Primer / Base Coat”. It implies the coating is designed to sit on primed or prepared substrates.
The general system page lists MP44 among “Performance Coatings” designed to protect against water, frost and sun damage on walls.
Common substrate types (in practice):
- Brickwork (standard clay bricks)
- Blockwork (concrete, breeze block)
- Rendered masonry (traditional cement or sand/cement render)
- Rough-cast or pebble-dash finishes (if sound and well adhered)
- Fibre-cement (in some deeper refurbishment systems, but need to check compatibility)
- Possibly precast concrete panels or insulated render systems (subject to spec).
Important substrate-preparation notes:
The substrate must be dry, clean (free of algae, lichen, grease), and structurally sound (no loose materials). The TDS emphasises removal of loose/flaking materials. Wethertex
Moisture content must be within acceptable limits (humidity < 85% is noted for application).
Substrate temperature must be within the allowable application range: –5 °C to +25 °C (approx) and humidity < 95%.
Certain substrates may require levelling or base-coat (e.g., Wethertex GRC fibre-glass reinforced polymer base coat) before applying MP44.
Why this matters: The right substrate means the coating will perform as designed (adhesion, waterproofing, breathability). Mis-application over unsuitable or untreated surfaces can lead to failure (peeling, blistering, mould, damp ingress), reducing ROI and increasing risk.
7. Is Wethertex MP44 energy efficient or does it improve insulation?
While MP44 is not primarily marketed as an insulation material, there are energy-efficiency and protective benefits that indirectly contribute to better thermal performance of the wall assembly.
What the product does:
MP44 improves the wall’s resistance to wind-driven rain and reduces ingress of moisture. A drier wall substrate means better thermal performance (wet masonry has poorer insulation value, higher risk of thermal bridging or condensation).
By forming a durable finish, MP44 helps reduce the need for frequent repainting or remedial works, which in turn means fewer disruptions and less energy/material waste.
What the product does not claim:
MP44 does not replace insulation systems (e.g., EPS, PIR boards, mineral wool) and does not fundamentally increase the U-value of the wall via a thick thermal layer.
The manufacturer’s data sheet focuses on adhesion, breathability, and waterproofing; it does not provide explicit R-value or U-value improvement figures.
Why this matters: For specifiers and clients concerned with energy efficiency (especially in the UK where energy regulation is growing), MP44 offers indirect benefits. Ensuring the external finish is robust, breathable and weather-resistant contributes to the overall building envelope performance. If the wall insulation is already in place or the homeowners are refurbishing, applying MP44 will protect the system and maintain its integrity.
Additionally, as energy costs rise and sustainability concerns increase, being able to say “my external coating helps maintain the building envelope and prevent heat loss via moisture control” is a positive selling point.
8. What colours and finishes are available in Wethertex MP44?
Image Source: Wethertex.co.uk
Appearance is an important factor for homeowners and commercial property owners alike — colour and finish must suit the property style, planning/heritage requirements and personal taste.
What Wethertex offers:
The performance coatings section states for MP44: “Pack Size: 25 kg Coverage: Approx. 10-25 m² per unit (dependent on substrate) · Colours:.” (although the specific palette is not detailed in the excerpt).
Case studies refer to “a wide range of colours are available as standard” (see the Colwyn Bay terrace case).
Textures: While MP44 is a “spray applied through-coloured wall coating”, it is typically a relatively smooth finish compared to heavy-texture coatings (e.g., Wethertex HD77 heavy texture). For more textured finishes, Wethertex specify those systems separately.
Things to check / specify:
Confirm the colour range: homeowners should review the manufacturer’s colour chart / swatch book to ensure the selected shade is available in MP44 (especially if heritage/Conservation Area rules apply).
Consider finish sheen: Through-coloured coatings mean the pigment is throughout the film, which helps with maintenance (fading/chalking).
Consider substrate and exposure: Some colours (very dark) may show dirt or fade more quickly in high UV or highly exposed sites.
Ensure the correct film thickness and colour consistency via professional applicators — irregular application can produce visible shade variation, particularly with strong colours.
Why this matters: For many homeowners, the aesthetic outcome is as important as the technical performance. Being able to offer a wide palette and reputable finish (from a trusted brand) increases the value proposition of using MP44 rather than a cheap repaint.
Image Source: Wethertex.co.uk
9. How much does Wethertex MP44 cost per square metre?
Cost is a key concern for homeowners and contractors alike. While the manufacturer doesn’t publish a fixed “cost per m²” (because substrate and project specifics vary), we can derive key cost factors:
Manufacturer data that impacts cost:
Coverage: The technical data sheet lists coverage approx. 10-20 m² per 25 kg unit (dependent on nature & porosity of substrate).
Pack size: 25 kg drum.
Application constraints: Correct preparation (cleaning power wash, substrate repair), primer/base coat may be required, application via spray (equipment + labour cost) etc.
Estimating cost per m²:
If 25 kg covers say 15 m² (taking midpoint of 10-20 m²), then material cost will be “price of 25 kg drum divided by 15”.
But total installed cost will be higher: include primer/base coat if needed, labour (spray application), scaffolding, surface repair, colour choice, access/height of building.
Contractors will often provide a “per m²” installed rate for similar coatings; you may want to get 2-3 quotes in your region to compare.
Be sure to factor in lifecycle cost: though MP44 may cost more upfront, its long lifespan and low maintenance mean lower re-coat cost over time.
What you should do when quoting:
Ask for a breakdown: material cost, labour cost, substrate preparation cost, access/scaffolding cost, colour surcharge (if any).
Ask for expected lifespan and maintenance schedule to compare “cost per year” not just “cost today”.
Check whether manufacturer’s warranties or installer guarantees are included (which may affect value).
Use the coverage figure as a sanity check: if a quote uses significantly higher coverage assumptions (say 30 m² per 25 kg), it might indicate a thinner film (and hence lower performance/lifespan).
Why this matters: For most decision-makers (homeowners, specifiers), cost versus benefit (longevity, performance, appearance) is central. Providing clear cost transparency strengthens trust and helps justify the more premium product.
10. Where can I find an approved installer?
Once decision-makers have evaluated performance and cost, they typically move to sourcing product and applicator. Here are the key points.
Manufacturer’s supply network:
Wethertex products are only supplied through a specialist nationwide network of suppliers and they have expert teams of approved applicators
(such as us; Pinnacle Wall Coatings) located across the UK.
For installers: Prefer applicators who are experienced with Pliolite systems, can show previous case studies, and offer warranties for their work.
Location: In UK the availability may be good, but remote locations may need to factor in shipping/travel.
Quote comparison: Ask for supply cost + application cost + any extras (scaffolding, access, traffic management, colour premium).
Why this matters: Using non-authorized supply or untrained applicator increases risk of incorrect product, poor performance, early failure. Ensuring you buy genuine MP44 from authorised source and apply via competent installer helps protect brand performance claims and warranty.
Conclusion: Why Wethertex MP44 Is the Professional’s Choice for Lasting Protection
One thing is clear — this is far more than just a paint. MP44 is a high-performance wall coating system, built with decades of research, premium Pliolite® resin technology, and real-world endurance on thousands of UK homes and commercial properties.
Here’s what truly sets it apart:
Durability: Professionally applied MP44 can protect your property for up to four decades — far outlasting any standard masonry paint.
Waterproof and breathable: Its microporous design keeps rain out but lets trapped vapour escape, preventing damp and mould.
All-weather performance: MP44 can be applied even in colder conditions and provides robust resistance to frost, UV, and algae growth.
Flexible and resilient: The coating moves with your walls, helping prevent cracking and peeling.
Professional-only system: Proper surface preparation, primer selection, and spray application require approved contractors — ensuring the finish performs exactly as intended.
Cost-effective over time: While the initial investment is higher, MP44’s lifespan and minimal maintenance deliver excellent long-term value.
Aesthetic choice: Available in a wide palette of UV-stable colours and smooth or lightly textured finishes, it enhances your home’s appearance and kerb appeal.
In short, Wethertex MP44 is the smart choice for homeowners who want lasting protection, not repeat painting. But that performance depends entirely on skilled installation.
At Pinnacle Wall Coatings, we work exclusively with Wethertex-approved applicators, ensuring every project meets manufacturer standards and carries full product warranty coverage. From preparation to final inspection, our team delivers results that not only look exceptional but perform for decades.
If you would like our expert company help you transform your property's exterior with one of our 15 year guaranteed wall coatings, then please call us on 020 8906 6552 or click the link below to request a free no obligation quote. We cover the whole of England and Wales and we'll beat any like for like quote.
FAQ's Summary
1. What is Wethertex MP44 Exterior Wall Coating made of?
Wethertex MP44 is built on Pliolite® resin technology — a solvent-based styrene-acrylic system that deeply bonds with masonry surfaces. It forms a microporous film, which allows moisture vapour to escape while keeping out wind-driven rain. The formulation includes water repellents, flexible polymers, UV-stable pigments, and anti-fungal agents.
For best results, these specialist materials must be mixed and applied under controlled conditions — another reason the coating should be handled by approved professionals.
2. How long does Wethertex MP44 last once applied?
When applied correctly by trained applicators, Wethertex MP44 can protect a property for 20–40 years. Pliolite resins have a 45+ year track record of real-world performance across the UK. Professional contractors ensure the correct film build and curing conditions — critical factors that directly affect longevity.
Poor DIY or unapproved applications can halve the lifespan of the coating. That’s why Pinnacle Wall Coatings only uses manufacturer-approved teams for guaranteed performance. See real case studies.
3. Is Wethertex MP44 waterproof and breathable?
Yes — and that’s one of its biggest advantages. MP44’s unique microporous structure blocks water ingress while still allowing trapped vapour to escape. This prevents damp, mould, and condensation issues common with cheaper masonry paints.
However, that balance of waterproofing and breathability depends entirely on correct application. If applied too thickly or on unprepared walls, the breathability can be compromised. That’s why only approved contractors are trusted to install MP44 to specification.
Learn more about how Pliolite technology works.
4. Can Wethertex MP44 be applied over existing paint or render?
Yes — but only after thorough preparation by professionals. Loose paint, cracks, and biological growths must be removed; walls may require priming with Wethertex PP1 Primer.
Approved contractors use specialised cleaning systems, primers, and diagnostic tools to test adhesion and moisture content before spraying. This preparation ensures long-term adhesion and prevents future peeling or bubbling.
See full details in the Wethertex MP44 Technical Data Sheet (PDF).
5. How is Wethertex MP44 applied — brush, roller, or spray?
Wethertex MP44 is a spray-applied wall coating, not a brush-on paint. Professional contractors use high-pressure spray equipment to deliver an even, consistent finish. The coating is applied in multiple fine passes, overlapping by around 30% to avoid shading.
DIY brushes and rollers cannot replicate the controlled film thickness or texture required for full weather protection. Spray application by approved teams ensures the correct build, colour depth, and adhesion.
Review application process.
6. What surfaces can Wethertex MP44 be used on?
MP44 is suitable for most exterior masonry, including brickwork, blockwork, rendered walls, and pebble-dash. The substrate must be dry, stable, and free from defects.
Approved installers will test substrate conditions and apply the correct primer or base coat if needed. They’re trained to recognise issues like rising damp, efflorescence, or hollow render that could affect adhesion — ensuring a flawless, warrantied finish.
7. Does Wethertex MP44 improve energy efficiency?
While not an insulation layer, Wethertex MP44 helps reduce heat loss by keeping masonry dry and breathable. Damp walls lose up to 50% more heat than dry ones, so MP44’s waterproof properties directly improve energy efficiency.
However, the coating’s thermal performance depends on correct application thickness and coverage — achievable only with calibrated spray systems used by certified contractors.
8. What colours and finishes are available?
Wethertex MP44 comes in a wide range of UV-stable, through-coloured finishes, from subtle off-whites to bold modern tones. Professional sprayers can achieve smooth or lightly textured finishes, depending on the nozzle and technique used.
Approved contractors (like us) receive access to the full Wethertex colour portfolio and can match coatings to your home’s existing render or local planning requirements.
View the colour range.
9. How much does Wethertex MP44 cost per m²?
Professional installation of Wethertex MP44 typically ranges from £30–£100+ per m², depending on surface condition, access, and colour.
DIY prices are misleading because MP44 isn’t designed for homeowner application — it requires specialist equipment, PPE, and certification. When installed by approved contractors, the system includes full preparation, primers, spray application, and often a 10- to 15-year manufacturer-backed warranty.
See coverage and technical data here.
10. Where can I buy Wethertex MP44 or find an approved installer?
Wethertex MP44 is supplied through authorised stockists and trained application partners — not retail stores. To maintain warranty and ensure proper film thickness, only certified contractors are allowed to purchase and apply MP44.
At Pinnacle Wall Coatings, we work exclusively with Wethertex-approved installers throughout the UK. Every installation includes a manufacturer warranty, professional site preparation, and the highest-quality finish.
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