I agree, no primer. If you use a half tinted blue primer you're starting out from a coverage setback. A dark blue will cover a dark red fine, and far better than it would a medium blue primer. If you use BM Genex colors there really is no longer a primer required when changing colors. Genex tints are superior in terms of hide, coverage. BM says two coats of red only, ever. And it's the reds that have the least hide historically. Genex products, like Aura and Regal Select, are pricier but they save you time and labor, your two biggest expenditures. But you can go with BM BEN, which is probably priced between topline BM and Valspar, closer to Valspar. Pricier products cost more for a reason, they work for you better than lower priced materials. A cheap brush costs you more in time and aggravation in making it work for you than you would spend buying the pricier pro brush, and you'll get better results. The same goes for paint. The goal is to be effective and efficient. Do the best possible job using the least, the optimal, amount of resources. Labor is always your biggest expense and dwarfs materials cost, and not operating from that understanding at the outset is the start of a fools errand. Save the gift certificates for hardware or grass seed.