detox, I used Z-Poxy to seal the inside of the tub...on the outside, I will be applying 3 coats of sanding sealer. I am a painting contractor and have been finishing wood for years and this stuff seals and sands very nice. Much easier to sand than Z-Poxy. Next I will prime, spot fill, sand, prime, sand and then if everything looks ready...paint. Here's pictures of my Avenger/Spider that I sealed the same way...