[BobF]

Red is perhaps the hardest color for a DIYer to use and get satisfactory results. The reason is that there is so much pigment involved. It is hard to get that much pigment evenly distributed. Here are some tips to increase your chances of success.

Start with quality paints from a paint store. I won't name brands here. It is a topic that generates much heated discussion. The better paints do help get an even distribution of the pigments.

Use quality tools. A $2 brush will give you a $2 job. Better quality brushes and roller sleeves hold more paint and allows better flow of the paint to whatever you are painting.

Use a good primer, regardless of the condition of the existing coating. Have the primer tinted a medium gray. Over the years, several posters have commented on success with the primer tinted a lighter shade of the final color. Recently, black has been touted as a good undercoat.

Do not skimp on the paint. Do not over-brush nor over-roll the paint. When cutting in, brush the paint on in one stroke. Back brush at most one time, and then only if really needed. Do not keep brushing what you have just painted.
A roller sleeve of paint is only good for one vertical strip, floor to ceiling. Paint the strip right next to what was just painted, then one light pass to blend the new strip with the previous strip. No more. Avoid the W pattern.

Keep a wet edge. For most DIYers, this means having help. One will cut in and the other rolls right behind them. If working by yourself, work in small sections of the wall, alternating between cutting in and rolling.