2003 Travel Star 21SB outer floor/membrane repair

This is my thinking on this and take it with a grain of salt. looks like the membrane has been compromised in a bunch of areas. My guess no matter how well you seal it moisture will probably get up in there. With this said why not use bug screen instead so it can breath... after traveling in the rain the floor under will air dry out. With the age of your TT this might be a option.

BTW I had a similar problem on one of my past TT's and this is what I did. worked out well.

Good luck

Mike