I'm doing my cap now. I had the ZEP, won't do that again. I started with 600 grit wet sanding with a continuous water spray, then 1500 grit wet same way. You'll start to see the shine once it drys after the 1500. Polishing compound and I'm applying it by hand with a 1/2" thick dampened white felt pad. At this point it beaded up in a rain we just had. Next step I'm going to apply Meguire's Synthetic Sealant which I use on my truck.