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When I was sanding I attached the orbital sander to a small wet/dry vacuum and had virtually no dust to contend with. If you do sand the stuff be sure and wear a mask. But first try power washing the bottom. That is if you don't have holes in the bottom. I first used chemical strippers to get the bottom paint off but then tried my fairly powerless electric power washer and it easily got most of the old bottom paint off. Check my personal page.