Frequently Asked Questions

Q. Can you apply a water-based product, like Aqua ZAR® Polyurethane or ZAR® ULTRA Max Polyurethane, over an oil-based one like ZAR® ULTRA Polyurethane?

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 apply an oil-based product, like ZAR® ULTRA Polyurethane, over a water-based one like Aqua ZAR® or ZAR® ULTRA Max Polyurethane?

A. Yes. As long as the water-based polyurethane has been down for at least 3-6 months, you can sand the surface with 150 grit sandpaper and then apply your oil-based product.

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.