You need to talk to the primer installer for his advice. You need to know what kind of primer it is. Some are really hard and take awhile to sand, and some are soft and you can sand right through them. In general you would sand with 400 grit wet/dry paper.You will need sanding blocks made of rubber or wood covered with a soft pad. They need to be straight and stiff, but not have, hard sharp corners that will dig in. Sand till the orange peel is almost gone. You will notice as you sand that the water beads up when you first start sanding. When you are at the right spot it no longer beads up. This is trial and error till you get the feel for it. Is the guide coat a black spotty looking spray over the whole truck? If it is, this also helps when finish sanding. It lets you know where the high and low spots are. Try not to sand any deep areas with your hands, this is a low spot and the body man needs to see it. I would do my best at sanding then take it back and let the body man tell you if its enough or not.
When done sanding the whole truck, use dishwashing liquid and hot soapy water to wash. This cleans any grease from your finger prints and the grit left from sanding. Blow dry the cracks and door jams if painting anytime soon after. I used a leaf blower and it worked great. You can never have enough hot air
! Joe
