The poly was oil-based finally. Sorry for misleading.
Originally Posted by McCreed
I've never used water based poly, but everything I've read says it can only be thinned with water.
Mineral Spirits (what we call Mineral Turpentine) is used for thinning oil based products. It certainly looks like it worked, but I'm curious how.
It doesn't seem possible from a chemistry view. (However, I am not a chemist)