Also, never paint when the temperature is more than 90 F. If the blisters appear after a month or so, the problem is probably poor surface preparation. Unless such films are removed before painting, they can cause blistering. Also, glossy surfaces must be given a light sanding, so the new paint will grip well. Peeling is the curling of large pieces of dried paint and is merely a later manifestation of blistering. Severe peeling might also indicate use of a poor primer, or a heavy film of dirt, grease or dust.
Prevention involves sanding or wiping the old finish with a deglossing liquid.
Then follow the manufacturer s directions as to what primer might be required before applying the top coat of paint. Alligatoring is a cracking and flaking of the paint in a square pattern. It can result from applying paint over a previous coat that had a high gloss finish that was not sanded, use of the wrong primer or use of old paint, particularly paint that s been stored in an unheated space and allowed to freeze. To repair the condition, sand the surface smooth and apply the proper primer before applying a new top coat. Checking is a series of long lines, with shorter check marks crossing between, usually caused by the wood underneath expanding and contracting.