The Body filler is a lot of work, time consuming and has a steep learning curve. You have to learn how to mix it, how thick to apply it, how to sand it and what tools to use. I have 3 sanding boards, 2 flexible and 1 rigid, 1 curved sanding block for inside radius and a power (air) sander. The sand paper is 40, 80, 120, 150, and 220 grit. Two different fillers were used a fiber glass filler mix (Duraglass) and a light wieght filler (Evercoat). I applied the Duraglass as the base coat then the light weight filler (easier to sand) as the top coat and always got it too thick which takes a lot of sanding to get it to the right thickness. Using the power sander first with 40 grit to knock it down and fairly even then changing to 80 grit, then 150 and finally 220 grit. You need a good mixing surface such as a plastic board or I used an old piece of glass and spreaders of different sizes. If you are doing a whole car be prepared for a lot of very messy and dusty work. Please remember to ...