I wanted to reseal the joints on the roof of our T1350. It was already sealed (sorta), mostly by previous owner(s) using silicones and other products that eventually dried up and cracked. It never did leak, but why tempt fate.
Being a small trailer and smaller roof and not being all that young anymore just getting up there and down, not to mention moving around between vents and AC unit was a challenge.
I went up there with a screw driver, hammer, scrapper (putty knife) and started to dig and chip away the old junk. It took a couple of hours but 99.9% cleaned off. Brushed off all the old dust and dirt. and masked the two sides for each seam end-to-end.
Here's the GOOD NEWS. I went to a couple of local well known RV shops and they recommended a couple of specific products for this project, self leveling too. I didn't want to spend over $100 just to do this job.
I searched and search and found that Rust-Oleum, makers of Tremclad had their version of a spray on sealer Like that guy on TV that sprays his row boat. This stuff is called Leak Seal.
I sprayed on the two coats waiting the appropriate amount of time and you can actually see that stuff bubble or effervesce and it soaks or sinks into the seams.
They say it takes 15 to 30 minutes to cure.
It's flexible and paintable. I just finished the entire job and wouldn't you know it, it started to rain
I'll wait a day or two and paint the entire roof with that Tremclad "Recreational White", kind of a beige color.
That one can did all the seams and few other spots and I still have some left over $12 CDN.
If you don't mind a little elbow grease you can have that perfectly sealed roof. I found also that this stuff, because it sprays on and doesn't go on like a tube of caulking, that there's no lumping up
Disclaimer: I didn't want this post to come across as a product endorsement but rather how many of us with older trailers can do a perfect job on a slight budget.
This will also give you that opportunity to inspect the rest of your roof for cracked or broken vents and see how good or how bad those putty gaskets are