I have had the crinkel thing while painting a phone with Tremclad Spray paint. I sprayed over an area that had been sprayed with a non Tremcald paint (Krylon) and the Krylon started to crinkel up. I think it's because of the etching elements and gasses escaping from the drying Tremclad.

Dont mix paints, and if you do wait a real long time for them to dry.