scratches

Finally got my hood laser straight using acrylic blocks. Finished sanding with 220 grit and sprayed 2 coats of SPI epoxy yesterday. I will be spraying 3 coats of base from the manufacture, Motobase. The colors will be solid. Colors will be tan and white. I have a few questions: 1. I am told I...

I have my car finished in 320 grit, and I plan on going over with 400 dry prior to epoxy as a sealer...my question is, is it super difficult to remove all prior scratches when going to the next grit, or am I over thinking it? I usually try to throw a few coats of epoxy over the car, give it a...