Re: removing old seam sealer
3M makes a paint and rust stripper wheel; sort of looks like a Scotch Brite pad on steroids. They sell for about $6 each at most paint/body/auto stores. I use it in a drill and have had good luck with seam sealer, paint, rust, undercoating... Watch the direction you spin the drill compared to a metal edge or you will shred the wheel quickly.
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