Geocel Aquarium Sealant

Yes, I have used it for sticking bits ofslate together for a cave, and for sticking rocks (some quite heavy/large) together for decor.

It's good stuff. Just make sure you let it dry for the full amount (36hrs IIRC) before submerging.

Can't say for sure on the polycarbonate, but I imagine it'll be fine. Just make sure the surfaces are completely clean and dry- particularly ensure you keep it free from oil (which you will put on it if you touch the polycarbonate with your bare fingers).
 

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