hate when a plug splits... got a triple- 2 blues on the popper and a striper on a teaser with this plug and it split paint stuck good, its still bugging me why it split.
I use mineral spirits, 60% oil, 40% solvent. Turps might be better, but this dries quickly (overnight) without odor and I think it is the oil that does the sealing, not the solvent. Sand lightly before you prime.