Re: Rubber gasket between lid and body
We just recently had SMB spray the PH Top and the van roof with RaptorLine (like Rhino lining) and my gasket had been doing some similar stuff.
One thing that wasn't mentioned in the myriad of things you can do that worked for us is to wipe the gasket down with 303 Protectant. I don't know if its in my head or not but that stuff rocks for things like that (also use it to wipe down the fishing raft/pontoons) and it really helped maintain the PH Top gasket.
Hope that helps.