I like GE clear silicone thinned in a dixie cup with some mineral spirits. Apply with a disposable foam brush.

Kevin may do differently, so take his advice over mine. He seam seals a tremendous amount of tents so he has it down pat.

Edit to add that some corn starch / talc (think windchecker powder) puffed on the seam after it is sealed removes any tackiness.

Last edited by RockChucker30; 12/20/13.