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PVC and adhesives don't usually work well. Even 5200 can be peeled off PVC fairly easily after its cured.

I gave up on PVC after warnings from a friend that does a lot of professional boat repair and based on my own tests. I eventually ended up using a length of brass tubing stock as a mandrel and wrapped it with fiberglass tape then applied resin to make fiberglass tubes. I then used resin to glue in the fiberglass tubes. After that was all done, I installed the brass tubes in the conventional manner. Now I know no matter if the o-ring seal fails or the brass just rots out, the hull is still about as water proof at the tube locations as I'll ever get it.