1. Mix the latex paint with the non-sanded grout in a cup or bucket.
A good ratio to use is 1 part grout to 8 parts paint. So, if you're mixing a small amount, mix 1 tablespoon grout with a ½-cup paint. For a larger amount — like I used — mix 1 cup of grout with a ½ gallon of paint.
Ensure that all the grout is mixed in — otherwise, the granules may be visible on the chalkboard. I have found that a paint mixer drill attachment and a 5 gallon bucket is the simplest and most efficient way to blend a larger amount of paint.Note:
Grout is typically only available in large quantities — 10 pound boxes for around $12 — so plan accordingly. I knew I would be regrouting the shower and bought the Polyblend Non-Sanded
grout to match. Don't have any tiling plans in your future? You may have a friend who recently tiled an entry or bathroom, so ask to use some of theirs.
To cut the sheen in the high-gloss black "oops" paint I picked up at a discount and achieve the classic charcoal color I wanted, I mixed a ½ gallon of the black paint with 2 cups of white ceiling paint, then added the grout.