Dimmer.

And for Toby's number 1. True, when you can scratch it with a tumbnail, and it looks hard..sand. Sand your damndest right then.

For my tips.

Red MEKP and dispenser is the best thing since sliced bread, if you are going to do a lot of glassing.

You dont have to wait for one layer to dry to add another. If i'm building up a small secion, I will do 4 layers or so on one spot withone mix.

Do build up seams inside a box, rip apart chop matt and mix it in with bondo. Add hardener for the bondo, and then mash it in to the corners. That shit is concrete when it dries.

You can mix bondo and fiberglass resin, with resin hardener and get a pourable bondo that will self level. It will get pinholes, but it starts out a lot smoother.