For all Dark colors except yellow use primer that is tinted with 2 oz of black. If you use the zinzer deeptone primer especially with reds you get pepto bismal pink and it will take you 3-5 coats no matter who's paint you use. Same with white walls. Ralph Lauren, Behr, Evermore, Ben Moore, Sherwin Williams. Any Paint Manufacture that uses an accent or deep base will need a grey primer for best results. You have read the results of people that had there primer tinted the wrong color.