What spray sealant are you using?
I bought this product a few months ago to try on something around the house but it wasn't what I needed. I then came across a plastic bucket with a split in it and decided to see if it would seal.
It did seal it but after a few months, the "Leak seal" became brittle and started breaking away. I don't think plastic provides the best bonding surface for this product BUT, I also wouldn't think this "supposed" flexible rubber coating would become brittle either.
In the near future I will be using a spray sealant on my interior rivets, seams,etc before adding new insulation and reattaching the interior skin.
What product have forum users had the best luck with?