You're welcome!
Sorry you can't find it in Quebec--if there's a local aquarium club (many have web presences so they may turn up on a web search) they may know of local sources/alternative waterproofing options.
The tricky part with all the waterproofing stuff that's out there is making sure it's plant/fish/critter safe, which is why I'd go to the local aquarium club (or maybe the herp/frog people would know, too).
What about fiberglass resin (the stuff that's used to patch bathtubs, for example)? It's pricey here, but pretty common. It should also add strength to your water reservoir with the mesh/resin combo that's used (at least in the patch kids).
Drylock (a concrete sealant which also bonds to styrofoam and Great Stuff foam and is inert once cured) should be waterproof, but I gather it also is not commonly available up your way.
Just tossing out some ideas....
Catherine
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