Wethertex Approved Contractors

Choosing an exterior wall coating isn't just about colour or aesthetics — it's a structural decision that affects your home's durability, weather resistance, energy performance and long-term integrity. Wethertex is one of the UK's leading high-performance coating manufacturers, producing industrial-grade systems including MP44, HPS Flex-Coat Pro, and AX1 primers. These aren't comparable to standard masonry paint — they're engineered coatings designed to be installed by trained professionals, which is exactly why Wethertex Approved Contractors exist.

Approved installers go through manufacturer-led training, practical assessment, and ongoing performance audits to make sure installations actually meet the system's technical requirements. Applied correctly, a Wethertex system can protect a home for 20+ years. Applied incorrectly, even the best coating can fail early, trap moisture, or damage the substrate underneath.

What Is a Wethertex Approved Contractor?

A Wethertex Approved Contractor is a specialist installer who has completed manufacturer training and demonstrated they can apply Wethertex coatings to the correct technical standard. The status is earned, not purchased, and involves several layers of assessment:

• Manufacturer training — covering surface diagnostics, moisture behaviour in render, product-specific primers, flexibility-vs-breathability trade-offs, spray equipment settings, and correct film thickness. Most general decorators have no experience with any of this.
• Proven real-world experience — demonstrating consistent quality, correct use of the full Wethertex system (not cheap substitutes), and genuine understanding of building science rather than just painting technique.
• Ongoing audits — approval isn't for life. Contractors are checked on installation standards, repair accuracy, correct system use, customer satisfaction and warranty registration — and approval can be revoked if standards slip.
• Access to professional-only systems — some products are restricted to approved applicators because they need specialised equipment and controlled application conditions to perform as designed.

In short: an approved contractor isn't just a painter — they're a trained exterior coating technician with product-level expertise.

Why Approval Matters

Many homeowners don't realise the difference between an approved contractor and a standard painter until something goes wrong. Wethertex coatings are high-performance systems that need precise preparation, layering and application to work as intended.

Manufacturer-backed guarantees only apply when the full system is used, the installer is approved, and the application meets technical guidelines. If a non-approved contractor applies the product, Wethertex won't support any failures — regardless of how experienced that contractor claims to be.

Coating longevity — the 15-20+ year lifespan Wethertex systems are capable of only happens with the correct primers, correct thickness, controlled drying conditions, and all cracks and defects repaired first. Approved installers understand how each of these affects durability.

Substrate preparation is everything — over 90% of coating failures in the UK come down to poor preparation, not defective products. Approved contractors follow strict prep processes: biocide wash, render diagnostics, crack stitching, blown render removal, and moisture testing, all aimed at preventing future flaking, blistering, cracking and damp.

Correct system specification — different substrates need different systems. Old pebbledash needs deep-penetration primers; sand/cement render needs flexible body coats; brickwork may call for Pliolite-based systems; previously painted masonry needs adhesion testing first. An approved installer specifies correctly for long-term success.

Benefits of Using an Approved Contractor

Premium long-term protection — correct dry film thickness, full surface saturation, maximum waterproofing and correct curing all directly affect how long the coating lasts.

Damp prevention and breathability — incorrect application can trap moisture and cause internal damp. Approved installers measure substrate moisture and install genuinely breathable systems rather than sealing moisture inside the wall.

A better finish — most Wethertex systems are spray-applied using airless machines and precision nozzles, giving a premium, even, textured finish that general decorators can't replicate.

Peace of mind — an official guarantee, workmanship assurance, and Wethertex system certification, adding real value and protection if issues ever arise.

Less future maintenance — Wethertex coatings resist algae, repel dirt, resist flaking, and hold their colour. With approved installation, properties typically go 15+ years without needing repainting.

Popular Wethertex Systems Installed by Approved Contractors

Wethertex MP44 — a Pliolite®-based, solvent-based system known for exceptional adhesion, extreme weather resistance, and long-term colour stability, well suited to exposed coastal or high-wind properties. Read our full MP44 guide →

Wethertex HPS Flex-Coat Pro — a highly flexible coating built to bridge fine cracks and protect older render, in smooth or textured finishes. Getting the stretch and build-up right needs trained application.

Wethertex AX1 Primer — a deep-penetration primer that binds unstable surfaces and improves adhesion and waterproofing. Choosing the wrong primer is one of the most common causes of coating failure, which is exactly why this step needs an approved installer.

Wethertex OT25 Timber Protection — not a wall coating, but many approved contractors also apply it to soffits, fascias, and timber cladding, where its UV stability and flexibility outperform standard wood paint.

How a Property Is Assessed

Approved contractors run a thorough diagnostic survey before recommending any system: a full visual inspection for cracks, blown render, algae, and structural irregularities; moisture readings to rule out trapped water or rising damp; crack mapping (hairline cracks need flexible systems, structural cracks need deeper repair); identifying the render type — sand/cement, monocouche, pebbledash, lime, or previously painted; tap-testing for hollow or delaminated render; checking for UV damage or adhesion issues from previous coatings; and checking guttering and downpipes, since a leak can undermine even a perfect coating.

The Installation Process

Cleaning and biocide treatment removes dirt, algae, moss and any loose coating, then stabilises the surface against regrowth. Render repairs follow — removing hollow areas, crack stitching, mesh reinforcement, and restoring profile where needed. Everything nearby — windows, soffits, cars, driveways, planting — gets properly masked, since spray application needs precise protection. The correct primer goes on to match the substrate, since the wrong primer means a failed coating. The coating itself is then spray-applied in layers to build up to the required thickness, with correct viscosity, pressure and nozzle size. Finally, a quality check covers thickness, adhesion and visual inspection, followed by a walkthrough with the customer before the guarantee is issued. See our own step-by-step process for how this looks on a Pinnacle job.

How Contractors Are Vetted and Trained

Becoming approved means passing technical product training (the chemistry behind the products, correct surfaces for each system, drying and curing cycles), practical on-site training (spray machines, correct film thickness, specialist primers, texture finishes), and knowledge testing on system design, moisture behaviour and substrate diagnosis. Wethertex then runs ongoing quality audits to check installer work stays consistent — which is what ensures homeowners always get a genuinely certified professional, not just someone claiming to be.

Problems Caused by Non-Approved Installers

Homeowners using non-approved installers often see failures within 12-36 months: cracking from the wrong system, thickness or primer; peeling or flaking from an unstabilised or unprimed substrate, or coating applied too thin; trapped moisture leading to damp patches or bubbling; visible colour variation from uneven spraying or poor mixing; and voids where blown render was never repaired before coating. On top of all that, non-approved application invalidates the manufacturer warranty entirely. These problems typically cost homeowners thousands to put right — which is why approved installation is the smarter choice from the outset.

How to Check a Contractor Is Genuinely Approved

Ask to see their Wethertex accreditation certificate — approved installers hold both a physical and digital copy. Check their website for the Wethertex logo and approved contractor badge. Ask for proof of training records. Or contact Wethertex directly by phone, email, or through their find-a-contractor service to confirm approval. If a contractor hesitates or makes excuses when asked, that's a clear sign they're not approved.

Why Professional Installation Matters

Wethertex MP44 and related systems are engineered coatings, not general masonry paint. They need controlled spray technique, specific film thickness, correct primers, substrate moisture testing, and consistent application. Get any of that wrong and you risk solvent entrapment, micro-cracking, or adhesion failure. Approved contractors exist to make sure none of that happens, and that the guarantee behind the product actually holds up.

Pinnacle Is a Wethertex Approved Contractor

Every survey and every application on a Pinnacle job is carried out by our own directly employed, Wethertex-trained teams — never sub-contractors. Choosing an approved installer protects your home, guarantees genuine product performance, and gives you a proper, long-term outcome rather than a repeat expense. If you're considering an exterior wall coating, it pays to get it right the first time.