I have been in the bathtub reglazing business for 32 years. The best product is a synthetic porcelain. The base is an alaphatic urethane and it is made for water. Epoxy discolors very badly and regular urethanes peel because they are not made for water. We are so confident with our product that we give an 11 year warranty on our workmanship and material. If you have any questions, I am in the Chicagoland area and can be reached, by e-mail, at tubbin@sbcglobal.net. I hope this helps