It is not recommended to apply TotalBoat TotalFair over 1-part paints. Fairing with epoxy products should not be performed over any 1-part paints. TotalFair will not have the same bond strength with a 1-part coating compared with fiberglass, wood, metal, or other 2-part epoxy materials. As a convention, all fairing should be done before applying any topside paints to ensure the best bond with the substrate. TotalFair will likely not sand at the same rate as the 1-part paints as well, which could complicate the process of fairing by adding extra steps, labor to complete the fairing job, or material required.