Too many coats can result in crazing and solvent pop. Crazing shows up as fine cracks in the paint finish. Solvent pop shows up as pin holes. Both are caused buy paint film thickness. Popping more in enamels where the surface tacks off and the evapourating solvents pop through the tacked off film. Crazing is caused buy the paints film being to think and contracting as it cures.

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