I am using Ralph Lauren (flat) paint in a Calico Red color (Dark red). Have two coats on the wall and will need at LEAST two more at this rate. Can I use the Ralph Lauren Deeptone primer now (I know...should have started with it)? Will this help at this point, or will I still need two or more finish coats? I hate to cut-in cielings, but cutting-in four to five times is enough to send me over the deep edge!