Exit - When you say the bubbles went away on thier own using the Penetrol, do you mean that you did not go back and lightly re-roller at all? If so, how long did it take for them to go away? I will admit that at this point I feel alittle more comfortable with the mineral spirits, simply because I can see the bubble gone almost immediately. But if the Penetrol manages to lose the bubbles on it's own, it may be worth taking a second look at.