This is agreat idea that I would never have thought of.
I have several different makes of paint and I find that some are more suseptable to this problem than others.
I have some original Games Workshop paints from twenty years ago, that I still use regually. I'm pretty sure that 'Ghoul Grey' does not even exist anymore!
Anyway, I'm rambling again. I will try this trick with the more tiresome paints.
Thanks for the tip.
Karl.