Painting rough faced brick, block, or stone is unlike painting anything else you'll ever have to paint. The major difference is volume of labor needed and the amount of material. These types of surfaces will use twice as much material as any other. Being that these surfaces are so porous, they act like a sponge.
The labor comes in with the amount of effort required to work the material into these surfaces. It is slow, hot work. The materials used as far as paint are not any different from any other paint except there are a few special products that do about the same job as regular paint. They may be a little heavier for better hiding. Like wood and metal, there are fillers that can be used on the rough surfaces. They are latex or oil-based. They are worked into the surface with either a stiff brush designed for this work or a heavy roller.
Yes, you'll use a large amount of filler and only get about 200 square feet per gallon. However, the advantage to using filler is it smooths the surface which means you'll use less primer and less paint. Sometimes you may see someone trying to use drywall compound in place of block filler. This is not a good practice. Using a product for anything that it was not intended for can cost you more than using the right product. The one thing you can count on is that they will fail. Leaving you nothing but the same problem you started with plus a big mess to clean up. If you feel confident in your ability in using a spray to apply the filler or paint, that's great too. Just be sure to cover any surrounding surfaces not being painted and remember even if you use a sprayer the material will still have to be gone over with a roller to be sure the material is well worked into the surface.
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