mgaidica 10+ year member
CarAudio.com Veteran
Well im in the process of spreading bondo over about a 12"x10" concave surface. The first layer was spread with a regular plastic flat spreader.. I ran out of those, so i figured ide try a sponge brush. This sponge brush just saved me about 30-60 minutes of sanding. It makes such smoother spreads and it also allows u to make curves because the sponge conforms to the surface. Just trying to save all you some time in sanding..(because sanding *****!)