Water based Paint Flaking

Cause

A breakdown as a result of an emulsion paint being applied over an under-bound material such as distemper.

Solution

Remove completely back to bare plaster by scraping and washing. In some cases the application of a hot glue size over the emulsion can result in blistering occurring and making this coating more easy to remove.

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Cause

Caused by the application of a pigmented matt emulsion over a surface previously finished with a vinyl silk emulsion. This is where the adhesion of the most recently applied coating is poor and the underlying material offers no keying properties  for when the last coat of paint is applied.

Remedy

Rub down with a “Scotch Brite” pad and apply a thinned-down coat of good quality vinyl matt emulsion. If this fails to cure the problem then an acrylic primer should be tried. It may be necessary to reinstate with a vinyl silk or satin emulsion.

 Mud Cracking

Cause

Caused by the application of a matt emulsion over a surface previously finished with a vinyl silk emulsion. This is where the adhesion of the most recently applied coating is poor with the underlying silk finished material offering no keying properties for the newly applied matt finish.

Remedy

Rub down with suitable abrasive paper and  to a trial area apply a coat of good quality vinyl matt emulsion, thinned a necessary. If this fails to cure the problem, then an acrylic primer should be tried. It may be necessary to reinstate with an emulsion or acrylic with a higher sheen finish.

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Moisture ingress

Cause

Old defective putties allowing moisture ingress into the timber resulting in the wood splitting and corrosion of the glazing pins.

Remedy

Hack out the old putties and replace after priming the rebates. Burn off remaining paint coatings followed by thoroughly sanding down, clean nail heads or replace.

Treat knots, etc. if present and prime overall. A general  purpose primer suitable for wood and metal is usually recommended as this will contain rust inhibitive pigments.

This should be followed by an undercoat and finishing system oil or water based.

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Plywood Checking

 Cause

Breakdown of a paint system applied to plywood which has “checked” (the ply surface splitting) allowing moisture to enter and causing detachment of the paint coatings.

Solution

Scrape back to a firm edge by removing all loose and defective paint. A system based on glass fibre weave membrane may help to overcome further problems. Textured paints have proven to be more successful on this type of substrate than smooth coatings.

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