Reply by Jorge G.

I guess it might be true as his second coat is going on top of a non-dry coat in a cold temperature.

The conclusion I came to was that while the first coat might appear dry on the surface, it is not completely dry underneath. The solvent on the second coat acts as a wick and draws the not cured part of the first coat to the surface, producing the wrinkling. As I said this happened to me before, and if you look carefully at the wrinkles, they look as if they had air inside them, this can only come from a drawing out action.

-- Just because you’ve always done it that way doesn’t mean it’s not incredibly stupid.