[HardcoreZ28]

I'm assuming dry guide is a guide coat for on top of your primer? I use a spray on guide coat powder but I'm going to start using the dry stuff for economical reasons. Guide coat is a very very valuable tool when doing high quality jobs. It will show you nicks, scratches, and low spots you'd never see with your naked eye.

Just put it on and let it dry or adhere for maybe 5-10 minutes and sand it off. Use a flat block or rubber squegee and sand until all the guide coat is gone....if you start hitting bare metal and your still have your guide coat you know you have a low spot that needs filling. Don't bother using your guide coat until you are ready to sand with either 220 or 400 grit paper. If you're using coarser than that you're too far away from finished still.

Best of luck!

Oh and you can sand it either wet or dry. If you don't have to worry about rust coming up on you quickly I'd suggest wet sanding.