Frequently Asked Questions

Q. Can you apply a water-based product, like ZAR® Interior Water Base Poly Crystal Clear or ZAR® Interior Oil Modified Urethane Poly OMU, over an oil-based one like ZAR® Interior Oil Base Poly?

A. Yes, but first you’ll need to scuff up the surface. Simply sand the surface with sandpaper (minimum 120 grit) prior to application.

Q. Can you use exterior polyurethane indoors?

A. In general, the answer is no. When applied indoors, the product tends to acquire a whitish look. The exception? Feel free to use exterior polyurethane on window sills that receive direct sunlight.