This tub was a challenge in the fact that someone took and cleaned the bottom with acid that ate through the porcelain. The only option was replacement or repair and re-glaze!
After going through the 5 chemical steps of preparation I dug in to the 2 hours of puttying it took to begin to create a smoother surface! We use a product in the automotive field called U-Pol followed by a dolphin glaze. Both of these products are married to each other. If you do not do this step then dirt will attract to the surface wasting all that opportunity to do it right the 1st time!