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Are you using that cheap old bondo from one of the parts houses? If so, go to Oreily's and get some of their cheap bondo or body filler, find a PPG store and use their generic blue hardener. It will make things so much easier for you, it sands like butter. If you want it easier than that, go get yourself a bucket of Epoxy Putty called "Half Time". That stuff will make you throw rocks at regular body filler, it sands like warm butter. I know what it's like to do a bunch of hand sanding. I have a very good friend who has taught me alot about body work and he is very old school. Even after 10 years of doing projects with him, every time we do one of mine, he makes me do a butt load of hand sanding.