Can you paint high gloss polyurethane over satin poly?

Yes, you can paint high gloss polyurethane over satin polyurethane, but proper surface preparation is essential for good adhesion. Start by cleaning the surface thoroughly, then lightly sand the satin finish to create a rough texture for better bonding. After sanding, wipe away any dust, and you can then apply the high gloss polyurethane. Be sure to follow the manufacturer's instructions for the best results.