Am getting ready to start installing my new sheetmetal, what's the best seam sealer to use and where is the best place to get it? Any tips or tricks to get the best results? I really want to get this part right, to get lasting results. Thanks for the help.

I linke the 3M ultrapro urethane, economical and it's never let me down. Some of the two compnent sealers are nice and very fast but expensive and not worth the extra money in my opinion. Make sure you have primer down before you seal anything.