ok well i saw guys in a store who painted their pvc plumbing black with plastic paint and said it was safe they'd used it before and they gave me the brand and it worked fine on mine as well. I had a flex tubing that i have going from one thank to another that was white and didn't really match so i painted it. However if the pvc dried the flex is totally sticky; some say its the primer, anyway lots of theories, anybody have an answer on how to fix this. I've already tried vinegar like some have suggest no effect if only to remove part of the paint actually. Thanks for your suggestion guys.