Latex-Acrylic House Paint?

We need a lot of paint in very strange and specific colors for our project, so we wondered if it would be possible to use flat latex/acrylic house paint for most things. House paint comes in large quantities, and in so many colors that can be replicated perfectly. So convenient!

 
However, I was worried about how the latex/acrylic paint would work with the technique I plan to use to paint the foamies - too much latex makes the surface of the puppets sticky, even when they are completely dry. So, I tested the normal mixture of latex and acrylic on top of some pre-latexed foam bits, and discovered that the house paint cracks terribly, both with and without added latex. 

UGH And so, we will use the house paint for the wooden set pieces, and will go with some nice acrylics from Jerry's and try our best to match batches of color to each other. A little variety might be nice?