I used Krylon Fusion (good adhesion to plastics, as recommended in this forum) recently, and it worked quite well. It says it takes 15 minutes to dry, and it's true, it wasn't tacky after 15 minutes. I let it dry for 24 hours and gave it a rinse before using it. However, it still made some tiny blisters after a few days in the water which aren't too bothersome.
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The coolest fish I've owned: Silver Arowana, Silver and Gold Datnoids, Archer Fish, Anableps, Mudskipper, African Leaf Fish, True Leaf Fish, Moth Catfish, Chaca Chaca, Apistogramma agasizzi.