On my build I just brushed interior latex paint right to the foam. No sealing no primer. For lighter colors I would use a primer or a paint with primer built in to reduce the coats needed to prevent the foam color from bleeding through the paint. Clark and Kensington and Valspar and Benjamin Moore all sell "Color Samples" and they can mix these bases into literally hundreds of colors. All the samples are a satin finish. So, there in-between flat and Semi-Gloss.
I work at an Ace store and we sell the sample cans for $4.99-$6.99 depending on brand. You should get about 25 sq ft per sample can. Latex paint is pretty durable stuff and very flexible as far as paint goes. And it cleans up with soap and water. And if you try a sample and like it you can always go back and get that color in a quart or gallon can. 100 sq ft coverage per quart.
Just a few thoughts.
Also, we have a spectrophotometer so we can "measure" a color sample and get a very close match if you have a color you really want and a brand color isn't close enough. You'll need a sample at least as big as a quarter for them to measure.
I work at an Ace store and we sell the sample cans for $4.99-$6.99 depending on brand. You should get about 25 sq ft per sample can. Latex paint is pretty durable stuff and very flexible as far as paint goes. And it cleans up with soap and water. And if you try a sample and like it you can always go back and get that color in a quart or gallon can. 100 sq ft coverage per quart.
Just a few thoughts.
Also, we have a spectrophotometer so we can "measure" a color sample and get a very close match if you have a color you really want and a brand color isn't close enough. You'll need a sample at least as big as a quarter for them to measure.