Wrinkling

A rough, crinkled paint surface, which occurs when uncured paint forms a "skin".

Paint applied too heavily.
Painting under extremely hot conditions or cool damp conditions, which causes the paint film to dry faster on top than on the bottom.
Exposure of uncured paint to rain, dew, fog, or high humidity levels.
Applying topcoat of paint to insufficiently cured primer or first coat of paint.
Painting over contaminated surface (e.g., dirt or wax).

Scrape or sand to remove the wrinkled coating; sand the surface smooth to blend it in to the surrounding coating. Make sure the surface is thoroughly clean.
If needed, prime bare areas with the appropriate primer, allowing it to dry completely.
Reapply the coating following the label and data page instructions for spreading rate and environmental conditions.