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From the Resene paint and decorating problem solver

Peeling paint is nearly always the result of poor surface preparation and in many cases is the result of poor surface preparation by the previous painter. New paint will not improve the adherence of the suspect old paint coating. Rather it is likely to make it slightly worse due to the stresses imparted as the new paint coating dries.

Waterborne paints take a few days to develop full adhesion especially if applied in heavy coats in dubious weather. This applies to many other paints as well.

Adhesion can be easily tested using the tape test. Note that the test result only applies to the spot where the test was done. An effort should be made to check how representative the result is of the entire job.

Tape test:

Thoroughly clean the test area. Use a sharp razor blade or putty knife and cut a small ‘X’ shape on the surface in the area you wish to test. Carefully apply half of a clean 4cm strip of tape to the cut area. Ensure the tape is firmly adhered by pressing it down with your thumb nail. Hold the free ends of the tape at right angles to the test surface and yank it off with a sharp pulling movement away from the surface. Observe the removed tape for old paint and stain. If paint is easily pulled off, the adhesion of that coating must be considered suspect.

Peeling is an adhesion failure whereby the paint film peels away from the surface. There are two types of peeling:

There are several possible explanations for a paint job that fails due to peeling. The failure can be the result of inadequate surface preparation in not:

Peeling can also be caused by applying the paint under conditions that hinder good film formation (very cold weather or very hot or windy weather that causes the paint to dry too quickly). The cause may be a combination of these factors. In situations involving many coats (more than 3-4) or old, solventborne paint, repainting can result in adhesion loss by the old paint and subsequent peeling. In cases where many layers of old oil-based paints are present, complete removal of the old and brittle layers of paint is recommended.


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