As mentioned before, sand or scuff the pvc before spraying. Use like 400-600 grit sand paper or a red scotchbrite pad. Let it dry for as long as possible, in my opinion minimum 24-48 hours, I'd like to see it dry for 30 days.
There is an adhesion promoter in the product that helps it stick to plastic better.
HTH
Spleify
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Current Tank Info: 60 gal SPS cube, with 25 gal refugium, 400W MH, DIY Lumenarc III, DIY skimmer, DIY stand and canopy. 40 breeder LPS with 40 gallon sump, DIY stand, 250W MH
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