Any paint labelled as satisfactory for use on masonry or cement should work on brick. Make sure you use a good quality primer also labelled for use on masonry because the material is usually porous even if it's been exposed to weather. Not always, but why take the chance of your mural not looking right because of uneven paint absorption?
Read the labels and follow the directions to ensure your finished project is everything you want it to be-use the right paint for the conditions the mural will be under after the painting is done. There is a primer and paint for interior OR exterior masonry and using the wrong ones will ruin your project.
Instead of using artist's paint, (would be very expencive) I would use a water based exterior flat paint. I have only painted murals inside and never on brick before but being that I have worked a paint department for thirty five years, I feel that would be the best paint to use on a masonry surface.
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