A seam at the corner of each bunk gave way this year, sewing with cotton-wrapped polyester thread. I will soak it to let it swell in the holes. Ordered in McNett/Gear Aid Seam Sealer. The instructions on it are for a tent - says to treat the "coated" side inside the tent. This obviously does not translate well to cloth backed vinyl ... How do I apply this then? And is it best to apply when the seam is wet or dry or doesn't matter ?