thin layers are better than a thick one. adding less hardener can create issues. heat or hotter days quicken the hardening process.
to answer your queerie
no i have not.
glazes: as marty mentioned...
http://www.evercoat.com/productCategory.aspx?cat=1Spot putty is another version of filler, but much finer and easier to sand. It doesn't need to be mixed and can be applied directly from the tube to the repair. The spot putty fills in any tiny impressions in the filler. Smooth (or glaze) spot putty across the repair surface with a flexible plastic spreader. It dries faster than the body filler, but be sure you give it enough time before you begin to sand it. Using 400-grit sandpaper, lightly and evenly sand the spot putty away. Sand it all away flat, and you'll be left with only tiny amounts of putty remaining in small scratches and gaps. These may seem minute, but even the smallest flaw will show up in the paint. o further prepare and protect your repair, you'll spray the surface with a primer/sealer. Mask off an area around the repair to avoid getting paint on any trim or other non-painted areas (don't forget, you don't want paint on your tires, either). Apply the spray primer in light, even coats. Three light coats are better than one heavy coat.Allow the primer coat to dry, then remove your masking tape and paper. To smooth the repaired area for painting, you'll use your 400 grit wet/dry sandpaper, but this time you're going to wet sand the repair. Fill a spray bottle with clean water and spray the repair area and the sandpaper. If you don't have a spray bottle you can use whatever method you can to keep the paper and repair area wet. Smoothly sand the primer using a straight back and forth motion. When you begin to see the old paint show through the primer, you've gone far enough. If you sand away too much primer and you can see metal again, you'll have to re-prime and re-sand.
You've now successfully repaired your car's body! Well, almost. It still needs to be painted. While you can buy touch up paint in a spray can at automotive stores, they pretty much suck. I've never seen a repair that's been spray painted at home look good at all. Paint is best left to a professional. With all the money you saved doing the repair yourself, you can afford to have it properly painted.
http://autorepair.about.com/od/fixityourself/ss/bondo_6.htm
