I used a brushable seam sealer made by evercoat automotive. I bought it through car quest auto parts. I'm not sure how long they are going to carry it here at least . Car quest was bought out by advance auto parts and are closing the car quest store and combining it into the advance store. I guess as long as there is a car quest store that sells body and paint supplies you can find the stuff.
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That seam sealer is some tough stuff,I bought some for my pickup ,
got mine at a regular paint store.