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Some Common painting problems

Sometimes, things just don't go to plan.   Listed below are some of the most common problems that can happen when you paint along with an explanation of why they occur and advice on how to rectify them.

Cracking and Flaking

This problem may start as just hairline cracks but as time passes, it can develop into peeling and flaking off of paint in large amounts.

Causes

Use of lower quality paint - the over thinning of paint - poor surface preparation or painting under cool or windy conditions which made the paint dry too fast.

Solution

If cracking does not go down to the substrate, sand to feather the edges of the cracks.  Prime any bare spots, and seal the surface with the appropriate undercoat, giving a smooth surface for repainting.  If cracking goes all the way down to the substrate remove all the paint by scraping and sanding and / or the use of a heat gun then prime and repaint.

Mould

Growth of mould on the paint film is unsightly and can occur for a variety of reasons.

Causes

The areas is subject to heavy condensation or damp and/or receives little direct sunlight - the use of low quality paint that has insufficient amount of fungicide or painting over a surface where mould has not been removed.

Solution

Remove mould with a solution of water and household bleach (one part bleach and three parts water.) Address the underlying root cause of the mould problem by improving ventilation within the room or by curing leaks and damp problems associated with the building structure itself.

Peeling

Paint peels off simply because it has poor adhesion to the surface beneath.

Causes

Inadequate surface preparation prior to painting Use of lower quality paint Applying oil based paint over a wet surface.

Solution

Remove all peeling paint with a scraper or wire brush.   Then properly prepare the surface to be repainted, sanding, sealing and priming as appropriate.

Wrinkling

Wrinkling happens when the paint forms a "skin" on the surface rather than drying properly.

Causes

Paint applied too thickly -  painting a hot surface or in hot weather -  applying a topcoat to an insufficiently dried first coat or painting over a contaminated surface.

Solution

Scrape and sand back the wrinkled coat.  Repaint with the appropriate finish, making sure the first coat or primer is fuly dry before applying the topcoat.   When painting in extremely hot, cool or damp conditions allow extra time for paint to dry completely.

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