Q: What grit sandpaper should I use between coats of Polo Plaz Primero (oil based)? The can says 120 – 150 grit but I read a lot of posts that say 220 or higher. I have a couple small rooms that I need to refinish so I’m planning on using a 5″ random orbital sander and using 3 coats.
A: It really depends on the environmental conditions you are working in. I’ve had it dry and harden so fast after each coat that 180 grit screen was barely enough to knock it down with inter coat buffing. I doubt 220 grit will get you through it unless you plan to use a lot of them. 180 grit at least. I generally use 120 grit sandpaper to hand rub the edges. Then I screen with 180 grit.
Related Q: What is the correct sandpaper grit to use between coats of polyurethane finish?
A: I use 120 grit to hand sand the edges and anywhere from 150-220 grit screens (which are not quite as aggresive as sand paper) used with a polisher, depending on the finish, how hard it is and whether it is water borne or oil based.