I’ve used Krylon Fusion for years and never once had an issue. I’ve never tried plasti dip. If one were to download the MSDS for both and compare, they may be able to tell if it’s worth pursuing.I’m speaking from experience, JK47 i believe used it on his PVC parts or it might be another member. Tons of people on this forum have used Krylon spray cans to paint PVC parts and other things that goes inside aquariums. Personally I have used it on a couple of tanks and all my fishes are still happily swimming today