it is pretty easy. I just washed the inside of the tub good with soap and water. Let it completely dry. Taped off what I did not want coated. I started with the white I had left over but I thought that would be too light so I got some of the gray at Menards. Just put it on in light coats until you get the desired coverage you want, I put on the last coat a little heavier. When I got done with the gray looked a little dark so put a thin coat of white over it to lighten it up. All in all went through 1 can of gray and whatever was left in the white which was probably a 1/2. The one problem I ran into was when I took the tape off some of the plasti dip stuck to it so it peeled away from the tub so I recommend taking off the tape soon after the last coat, I left mine on overnight. Not a big deal just cleaned up the lines with a razor blade.