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I wouldn't bother with paint or dyes. Our BioTek Marine PVC is colored all the way through and it has a nice polished finish.
Here's the link...
http://www.aquariumspecialty.com/parts-plumbing/pvc-parts?manufacturer=7101
unless the pvc in inside the tank.It's just dyeing the outside of the pvc, so I don't see any issues in using it.