Your saying that per coat? So, maybe 3 coats per gallon? I think I did 3 coats on all the jambs and stuff with the SS. Covered good,just had trouble keeping a nice wet coat. I think some of that was gun adjustment (I don't paint much) but a lot of it was the breeze messing me up.
You say 4 coats base... how many clear? and is it less/more liquid per coat on clear?