I would have to say no to putting anything with spray paint on it in your tank. Spray Paint contains lot's of harmful chemicals that won't be any good for your fish.
I'm not sure of any place that I can link you to for aquarium safe paints at the moment, maybe someone else can shed some light on the subject.
reason i ask is i am building a UGJ system for my tank and wanted to paint it to match my gravel.....as far as that goes after all the glue has cured it would be safe too right?
I'm guessing you are talking about pvc cement? yes when that is fully cured it should be fine. What you can do also instead of painting your pvc is either use black pvc or use "GE Silicon I" which is safe for the fish and smear it on then put your gravel on it. Let it cure for 24 hours and it should be ready for the tank. If you take a look at my pictures you'll see a pvc that i put a coat of sand on with silicon.
i been doing research on buildin ur own decor. i have a magazine that says you can use Great Stuff foam, and then cover it with silicone I. anyone know bout it
Are you talking about painting the riser tubes? These should be the only part of an UGF visible. The substraight glued to whatever with aquarium silicone sounds like a great idea and those fish houses look pretty cool Serial32.
I recently added another one in there for my Cichlids but my Stonefish usually takes them over. The silicon works great for hiding things with your own substrate.
I'm pretty sure that using the Great Stuff foam is ok for your aquarium.
