Originally Posted by hemiguy
Yes, that's true.
I seem to have fallen into a routine of 180 dry, 320 wet or dry, 600 wet. Just what seems to work for me.
It's too much gap there between 320 and 600. What works best for me is 320 dry and then (after couple more coats of primer) 400-600.
Of course you would 320 wet and give it a coat or two more and then finish off with 600.