Best seam sealer for the cab?

[Backpayne]

Originally Posted by SkinnyG

I used a two-part polyurethane seam sealer for that very gap and all other gaps/joins. Was either 3M or SEM. You'll need the fancy "two barrel" gun for it, too.

On cars I've cared less about, I used ordinary one-part seam sealer.

Not sure it really matters the brand.

Thanks! Those are the two seam sealers I've seen recommended the most in my research.