Identify Issue

Inspect render for signs of paint flaking

Prepare Surface

Remove loose flakes and clean surface thoroughly

Apply Primer

Use high-quality primer suitable for exterior render

Repair Flakes

Fill damaged areas with matching render filler

Paint Coat

Apply two coats of weatherproof exterior paint

Prevent Recurrence

Maintain render and repaint before paint aging

paint flaking on render – what to do: 4 Expert Fixes

Paint Flaking on Render – What to Do

Exterior painted render can succumb to moisture ingress, improper preparation, or non-breathable coatings, leading to unsightly peeling and potential substrate damage. Addressing paint flaking on render – what to do involves a systematic, step-by-step approach to restore both appearance and weather protection while preventing future issues.

Understanding the Causes

Paint flaking on render often stems from trapped moisture within the substrate, which expands and contracts with temperature changes. Incorrect paint selection—particularly non-breathable masonry paint—can lock in moisture, exacerbating peeling. Other common factors include inadequate surface preparation, residual contaminants, thermal movement, and render that hasn’t fully cured.

paint flaking on render – what to do

When faced with paint flaking on render, begin by assessing the extent of damage using a visual inspection to locate loose or bubbling paint. Test adhesion with a scraper, noting any sections that detach easily, and document the affected areas to plan repairs and estimate materials.

Preparation: Removing Flaking Paint

Use a stiff scraper or wire brush to remove all loose paint down to a firm edge; on a dry day, work in long, even strokes.
For stubborn patches, employ a low-pressure power washer on a gentle setting, taking care not to damage the render, then allow the surface to dry for at least 48 hours.
Clean the render with an anti-fungal wash to eliminate algae, dirt, and contaminants before proceeding.

Stabilising the Surface

Applying a stabilising sealer prevents remaining paint edges from peeling further and consolidates chalky render fibres. A water-based bonding primer such as Ceresit CT 16 Primer offers deep-penetrating action; apply two thin coats, allowing full drying between applications and testing adhesion with a small patch.

Repairing Render and Filling Cracks

Inspect for hairline cracks or voids and fill with a cement-based exterior filler like Toupret Murex (Rock Solid Filler); use a Kubala stainless steel spatula for precision.
Level the filler flush with the existing surface, tool off any excess, then allow it to cure fully before sanding smooth.
For larger repair areas, re-point or apply a matching through-coloured render layer to maintain visual consistency and durability.

Choosing Breathable Coatings

Opt for breathable masonry paints that allow moisture vapour to escape, such as Wethertex AP77 or Dulux Weathershield, to reduce the risk of future flaking. For specialist needs, CT-48 Silicone Paint offers proven vapour permeability ratings, and always prime with a high-performance exterior primer for improved adhesion and coverage.

Application Process

Prime all repaired and cleaned areas evenly using a masonry primer, ensuring full coverage for topcoat adhesion.
Apply two coats of breathable masonry paint with long-pile rollers for textured surfaces (e.g., a Hamilton roller set) and specialist brushes for edges (Harris Essentials brushes).
Work in mild, dry conditions, allowing 4–6 hours drying time between coats and avoiding direct sunlight or freezing temperatures.

Post-Repair Maintenance

To prolong the life of the render finish, schedule annual inspections using a soft-bristle brush and mild detergent to remove pollutants and prevent mould growth. Consider bi-annual soft washes to maintain cleanliness and monitor for signs of wear or new cracks.

Why Choose Simple Solutions 4 U

With over 15 years of joint experience in through-coloured render and external wall insulation systems, Simple Solutions 4 U combines top-tier products with certified craftsmanship. All major brands are stocked in-house, ensuring competitive pricing and trade discounts, while meticulous attention to detail guarantees customer satisfaction.

Contact the Experts

For professional solutions to paint flaking on render – what to do, contact Simple Solutions 4 U today. Call 07877 329 472, email info@simplesolution4ushop.co.uk, or visit our Contact Us page to schedule a free consultation and online estimate.

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