The distortion of undercoat components from the solvent reaction of an applied topcoat.
This refers to the rising of a dry paint film on application of the second coat. The paint film actually detaches itself. This phenomenon is visible when for example paint remover is applied to a paint film.
The softening and repenetration of a previous coat resulting in a wrinkling effect. This is caused by strong solvents in the topcoat attacking the partially cured or crosslinked undercoat.