OK you finishing experts, I have a question for you.
I like to use Formby's Tung Oil finish as a first coat before I finish with WOP. It seems to seal the wood better than starting with WOP, which seems to want to soak in a lot before it builds up.
My dilemma. I have a can which is still about half full, but it is getting thick and I would like to thin it a bit so I can keep using it.
What solvent can I use to thin it out a bit? Can I use regular paint thinner (mineral spirits)? Or do I need to use a laquer thinner or other solvent?
What do you suggest?