This technique has always worried me. I am scared that if I sand the top coat too much, it will burn through and scratch the base coat of the model. Does anyone know how to polish a model car correctly?
As far as I know, the top coat should have 3 coats of gloss. Then, wetsand it with 1000 grit for a few minutes, then move on to 3000, then 5000, 6000, 8000, then 10000. After all that has been done, use a polishing compund (such as Tamiya) and polish it using a cotton wheel buffer using a Dremel. Then, wipe out the excess residue from the polishing compund after you're done, and it should be shiny as heck.
But the thing I'm concerning the most, is that I have to use a lot of different grits of sandpaper, which means that I have to sand a lot. Should I be worried that it would burn through the top coat?