I have a customer with a pool table and front door that are finished in a poly top coat. I need to refinish them in black. Because of the location, size, and intricate details it is a bit impractical and awkward to strip them so I am considering painting them black over the poly. The question is can I achieve good adhesion and what would be the recommended process and products to use?
From contributor C:
Sand with a coarse (60 grit) sanding sponge (3M sandblaster) - just scuff, don't sand hard. Don't freak out at the grit size, the sanding sponges give a lot finer cut than paper of the same grit and used with a gentle pressure this step will be amazingly easy and quick. You could use the 80 or 100 grit sizes but you'd have to work harder to get the job done. After sanding dust thoroughly prime and paint.