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I just bought 'the Bondo starter kit', a starter for $15 or something, I did also purchase, which wasn't included in the kit, a file, tack cloth and extra patches.
The kit contains, sandpaper, primer, filler, cream hardener, putty, a patch, mixing plate, spatula, popsicle stick and a set of instructions, which on this occasion, I followed to the letter.
The patches I put on the inside of the holes, I think the instructions suggest putting them on the outside, but that didn't seem right.