It is actually quite easy to do.
1. Totally clean and degrease the slide after removing front and rear sights, firing pin and extractor.
2. Shake can for 3 minutes to get a good mix
3. Apply a very light, first coat and let dry for 30 min. Do that two more times. Each time you spray try for more coverage.
4. I put mine in an old toaster oven (using an oven thermometer to get the correct temp) at 350* for one hour. It will smell and smoke if you open the door. I did mine in the garage.
5. Let cool and reassemble.
Be sure to use some steel wool before spraying to even out the "not so even" Kel Tec finish. I did not and the other side is not as shiny.