[theastronaut]

Here's the dry guidecoat I made. It's compressed charcoal from an arts/crafts store, ground up by holding it against a 2" grinder disc over a paint cup to catch the dust. I cut down an old foam buffing pad to apply it. It gets down in the sanding scratches very well, and stays on until it's sanded off. This is over 1000 grit scratches.