I have not painted an aftermarket bumper in a long time and within 5 minutes of starting to sand this one I am having a problem. It is a YCC brand (Taiwan, of course) that the customer
supplied. There is a sticker on the inside that states that adhesion promoter and solvent based primer has been applied and to sand it with 800 grit sandpaper. I figured I better follow the
manufacturer instructions. First I washed the bumper with warm, soapy water (Dawn) and then began to sand it with 800. With very little sanding done I noticed the water was
beading on the bumper where I had just sanded. Obviously I had already sanded through the primer and was down to plastic. It is a spot about 3 in. wide/ 6 in. long at the bottom of
the bumper. I have scuffed it with a gray scotchbrite with Presta paste, used water-borne and solvent wax/grease remover, sanded with 600, 400, and even 320 and it still beads water
like it was just waxed. I do not know what else to do. Please help me out collision guys. Did a lot of rubber bumpers in the nineties (body shop) but now everything I do has metal or chrome
so I am kind of lost on the current procedures. Thanks, guys.
(It is marked PP on the inside)
supplied. There is a sticker on the inside that states that adhesion promoter and solvent based primer has been applied and to sand it with 800 grit sandpaper. I figured I better follow the
manufacturer instructions. First I washed the bumper with warm, soapy water (Dawn) and then began to sand it with 800. With very little sanding done I noticed the water was
beading on the bumper where I had just sanded. Obviously I had already sanded through the primer and was down to plastic. It is a spot about 3 in. wide/ 6 in. long at the bottom of
the bumper. I have scuffed it with a gray scotchbrite with Presta paste, used water-borne and solvent wax/grease remover, sanded with 600, 400, and even 320 and it still beads water
like it was just waxed. I do not know what else to do. Please help me out collision guys. Did a lot of rubber bumpers in the nineties (body shop) but now everything I do has metal or chrome
so I am kind of lost on the current procedures. Thanks, guys.
(It is marked PP on the inside)