
Could be due to a variety of causes. This could be moisture beneath the paint film or possibly paint has been applied to a greasy or powdery surface. Perhaps the paint was applied over a solvent based paint.
Scrape back to a firm edge all loose paint. Lightly sand the surface If the previous coating was a solvent-based paint or gloss finish then it will probably be necessary to repaint with a solvent-based paint again.
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