I recently made a fiberglass box for my Mazda MP3 (coincidence?). The structure turned out very well and I am happy with it. It fits liek a glove in the corner of my car. I am wanting to paint it, but it kinda sorta has a lumpy look to it. I want a piano finish but cant get the lumps out. I sanded the whole thing down real good and applied body filler, but I think i did it wrong. I pretty much sanded off all the filler and it only remains in the small holes. What is the correct way to apply body filler to fiberglass and get rid of the lumps?
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