I think you may find the pigment grind too course. One reason model paints are so expensive is because of the molecular size of the pigments, much harder to manufacture. House paint pigments are like sand, model pigments are like talc, for a comparison.
An example. Some automotive paints will cover 600 grit sand paper marks, some other paints these will show because of the density, porosity, of the paint. You could have it matched for wall colors tho!