Crows footing

Cause

Problems of this type occur when coatings, particularly water based paints are applied onto a surface which has a higher sheen level resulting in the adhesion quality of the newly applied paint being low, for example a matt emulsion being applied over a vinyl silk or an oil based coating.

It can also occur when water based paints are applied to new plaster without being thinned as a sealer coat.  This can result in the VOC’s (Volatile Organic Compound) being quickly absorbed into the surface resulting in poor adhesion of the coating.  Consequently, as the newly applied paint hardens the tensile strength of the newly applied paint film begins to shrink and cracks in the paint film appear.

Solution

After rubbing down and face filling with a fine plaster filler, applying a paint coating of a higher sheen level will in most cases overcome the problem.

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Crinkling

Cause

Softening of a previously applied coating caused by applying a subsequent coat before the underlying paint film is totally dry. Problems of this nature can also be as a result of applying paints such as chlorinated rubber which contain strong solvents over alkyd based paint finishes.

This type of problem can also occur when water based coatings are applied over an oil based sealer such as Alkali Resisting Primer or Stabilising Solutions for use onto a powdery substrate. And where the sealer coat has remained glossy and not flatted down before applying the top water based coats..

Solution

Occasionally it may be possible to remove the ridges. In severe cases complete removal may be necessary before re – painting can take place.

See Rivelling

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