Treecounter: Where is the leak? If you can figure out where the leaks originate, there are several methods to fix them.
Our TM has a sloped roof that allows water to run off, thank heavens, as Oregon rains constantly from Sept to May.
I have used Dacor, but switched to clearseal. You can find it in Camping World, next to the tubes of Dacor. Both are excellent, but clearseal comes in a pint container that you "paint" onto the surface. The reason I mention this, not wanting to get into "this is better, no this is way better", is that clearseal flows deeply into the roof. It will not self level like Dacor, but around vent pipes and those objects that penetrate the roof the clearseal will run down the pipe and seal the area around it. You have to paint on several layers, but once I did so you can see it seal the area. Also, you can use it in wet conditions, and it will stick to whatever it touches like silicone.
Just another possibility to seal your roof.
07 TM 40D;ISL 450 Cummins(upgraded). Very happy w/coach
Gnarly toad to scoot around.
Geocaching, hiking, fishing, National Parks, Civil War sites.