![Thinning Poly and Keeping Gloss](https://www.woodworkersjournal.com/wp-content/uploads/422QAMineralSpirits.jpg)
What is the difference between paint thinner and mineral spirits, and what can I use to thin the polyurethane and still not lose any of the gloss?
Michael Dresdner: Those are two terms for the same thing, and either will work nicely as a thinner for oil-based polyurethane.