Originally Posted by F470
I suspect the patch, not the seam because that's where the issue originated. It was fine for a week or two until I filled it with recommended pressure. My question is, what would you coat the exposed fabric with that would bond to the Hypalon adhesive? Would 3M 5200 Marine Adhesive appropriate? Would the adhesive used to bond Hypalon also adhere to the 5200? I suspect they didn't coat the exposed fabric which caused it not to adhere properly in that area. Will ask when I take it back in. Pain in the rear...
Delaminate the patch and apply a bigger patch with hypalon adhesive. You want a minimum of 2" away from the leak or affected area. The patch ideally should be circular.
It looks like it is coming from the seam to me. Seam leaks are nearly impossible fix...the ledge of material creates a tunnel for air to escape. There are two ways to fix a seam leak:
1.) The official way. Use a VERY lightweight material, say 300 denier or similar hypalon, and burnish the crap out of it. Lay the patch uphill and burnish the lower edge before you place down the upper edge.
2.) The easy way...rough up the material, wipe with toluene, then brush on some McNett's Aquaseal. Afterwards, put a patch over the whole shebang.
CAUTION : Nothing removes McNett's Aquaseal. Not heat, not solvent...only mechanical abrasion will remove it.
DO NOT USE 3M 4200 / 5200 / other silicone type sealants. They don't work for air leaks...they do work okay for water leaks though.
You will want to use a 2 part adhesive such as the Weaver 2001 hypalon glue kit.