Quote Originally Posted by Eric67 View Post
I did my own mix of water-based Polyurethane and Mineral Spirits (60-40 eye-balled)
I applied it with a paper rag, wiping it after 5-8 minutes.
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)