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Practice on something a million times before you do it on the car..
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Good advice, but I didn't and made a mess. I tried 2 3M products. First I tried the tan stuff that comes in a caulking tube but found it was too hard to brush well and ended up cleaning it off. I think this stuff may have been old as it was very dry and hard to work. For the second try I applied 3M brushable seam sealer with a small paint brush. The bristles on the brush I cut back to about a 1/2 inch and that worked just fine to apply it and brush it out.