Wethertex MP44 Exterior Wall Coating

When it comes to protecting a home's exterior, Wethertex MP44 stands out as one of the most proven, advanced systems available in the UK. Built on Pliolite® resin technology, it gives long-lasting protection against rain, frost and UV degradation while staying fully breathable.

Unlike standard masonry paint, MP44 is a professional-grade system engineered for deep adhesion, flexibility and minimal maintenance — which is why it's the product behind the majority of the jobs we carry out.

What Is Wethertex MP44 Made Of?

MP44 is formulated using Pliolite® resin technology — a solvent-based styrene-acrylic resin system built specifically for heavy-duty exterior protection. The resin forms a microporous film that gives excellent adhesion, durability and weather resistance.

Being solvent-based rather than purely water-borne means a smaller resin particle size, deeper penetration into the substrate, and stronger adhesion. The microporous film has pores smaller than those in typical masonry, which is what makes it breathable — vapour can escape while wind-driven rain is kept out. The formulation also includes water-repellency modifiers, pigmenting for colour stability, and (depending on substrate prep) anti-fungal treatment.

Understanding the composition matters because it explains why MP44 outperforms typical masonry paint on adhesion, weatherproofing and lifespan — and why it needs to be handled by trained professionals under controlled conditions.

How Long Does It Last?

Longevity is one of the coating's biggest selling points. Pliolite resin systems have a 45+ year track record of real-world UK performance, and when applied correctly by trained applicators, MP44 can protect a property for 20 to 40 years.

Real-world lifespan depends on substrate condition, local weather exposure, and — critically — the quality of the application itself: correct preparation, mixing, and spray technique. Poor or unapproved application can halve the coating's effective lifespan, which is exactly why we only work with manufacturer-approved teams.

Is It Fully Waterproof and Breathable?

Yes — and it's one of the coating's biggest advantages. The microporous structure blocks water ingress while still letting trapped vapour escape, which prevents the damp, mould and condensation issues that cheaper masonry paints often cause.

That balance between waterproofing and breathability depends entirely on correct application — applied too thickly or over an unprepared wall, breathability can be compromised. It's worth noting too that the coating protects the wall surface itself; it can't fix structural issues like broken flashings or a failed damp course, so the wall still needs to be sound and dry before application.

Can It Be Applied Over Existing Paint or Render?

Yes, with conditions. On a new, clean, dry, sound surface, MP44 can be applied directly once suitably prepared. For refurbishment work, all loose or flaking material has to come off first, cracks and structural defects made good, and the surface needs to be dry and free of algae, lichen and grease.

If existing paint is unstable or flaking, it must be removed — coating over defective paint shortens the new coating's lifespan. Sound, well-adhered render can usually be coated directly; cracked, spalling or moisture-damaged render needs remedial work first. Surface contamination gets removed by power-washing and, where needed, a fungicidal wash.

How Is It Applied?

MP44 is designed for spray application — that's the manufacturer's specified method, not brush or roller. Application follows a clear sequence: clean, dry, prepared substrate; priming where required; careful spray application maintaining a wet edge with roughly 30% overlap between passes to avoid patchiness; and protection from rain, frost or strong sun for the first 24 hours after application.

Correct application affects film uniformity, water-repellency, breathability and overall lifespan — which is exactly why we don't leave this to anyone without the manufacturer training. See our full application process for how this looks on an actual Pinnacle job.

What Surfaces Can It Be Used On?

MP44 is suitable for a wide range of exterior masonry, provided the substrate is properly prepared and primed: brickwork, blockwork, rendered masonry, and rough-cast or pebbledash finishes that are sound and well adhered. The wall needs to be dry, clean, and structurally sound, with moisture content and temperature within the manufacturer's application range. Some substrates need a levelling or base coat before MP44 goes on.

Getting this right matters — coating an unsuitable or unprepared surface risks peeling, blistering, mould or damp ingress down the line, undermining the whole point of the investment.

Does It Improve Energy Efficiency?

MP44 isn't marketed as an insulation product, but it does contribute indirectly to a wall's thermal performance. By keeping the substrate drier, it avoids the poorer insulation value and thermal bridging risk that comes with wet masonry. It doesn't replace insulation systems like EPS, PIR boards or mineral wool, and it won't fundamentally change a wall's U-value — but for a property that's already insulated, protecting the building envelope from moisture helps that insulation keep doing its job.

What Colours and Finishes Are Available?

MP44 comes in a wide range of through-coloured, UV-stable finishes, from subtle off-whites to bolder modern tones — since the pigment runs through the whole film rather than sitting on the surface, colour holds up well against fading and chalking over time. The finish is generally smooth to lightly textured. As an approved contractor, we have access to the full Wethertex colour range and can help match a shade to your property's existing style or any local planning requirements.

How Much Does It Cost?

There's no single published cost per square metre, because it depends on substrate condition and project specifics — but professional installation typically runs from roughly £30 to £100+ per m², factoring in preparation, any primer needed, and access. This isn't a DIY product: it requires specialist spray equipment and trained application, and when installed by an approved contractor it comes with proper preparation, primers, and — in Pinnacle's case — the full 20-year guarantee.

When comparing quotes, ask for a clear breakdown covering material, labour, substrate prep, and any access or scaffold costs, and check what guarantee is actually included.

Where Can You Find an Approved Installer?

Wethertex products are supplied only through a specialist nationwide network, with expert approved applicators located across the UK — Pinnacle among them. Using a non-authorised supplier or an untrained applicator raises the risk of the wrong product being used or poor application, both of which increase the chance of early failure. Buying genuine MP44 through an authorised source and having it applied by a competent, approved installer is what protects the manufacturer's performance claims and the warranty itself.

Why Wethertex MP44 Is the Professional's Choice

This is a genuine high-performance wall coating system, not just a premium paint — built on decades of Pliolite® resin development and proven across thousands of UK properties. Correctly applied, it can protect a property for up to four decades, stays waterproof while remaining breathable, holds up to frost, UV and algae growth, and flexes with the building rather than cracking.

Because it's a professional-only system — correct prep, primer choice and spray application all matter — its real-world performance depends entirely on the installer. At Pinnacle, we work exclusively with Wethertex-approved teams, so every project meets manufacturer standards and carries full warranty coverage, from preparation through to final inspection.