[{tpc}]

I would go with the alpha systems then. When I used the first stuff that I found, I could tell that it had a reaction to the roof. It wasn't terrible, but I could tell. When I used the alpha systems stuff there was also a reaction, but much much less. Of course the first try didn't work good anyways, the second try with the alpha systems stuff worked as expected.

I think you may be able to find it on their website, or on amazon. I know a local rv dealer to me who only uses it, but I am unsure if they would ship to montreal, as they are just kinda a mom and pop shop type place. I don't think they sell rv's, maybe just service them.