Yes, whereisdanielle also uses latex house paint. I would not recommend painting over any existing paint however, even with the crazy flexible house paints. honestly in all the extensive testing I've done, painting over paint or repainting over layers of existing paints, especially different types of paints is not a good idea for long term durability and flexibility. The more paint build up the more cracking increase on eva foam. So with thay said, I try to limit how much paint on top of other types of paint, especially on base coats. If you are set on a repaint, I would definitely try to use what ever you used before on the original paint job so that the flexibility agrees with what you already have on there.
The latex house paint is extremely strong, flexible like a rubber band and durable painted directly onto your sealer coat.
TurboCharizard got me on to Rustoleum Leak Seal a while back and him and I use it religiously. It's very strong foam sealer and is sandable. Once my Leak seal rubber coating is done, I lightly sand my entire suit smooth and also helps even better with the base paint adhesion. Leak seal does not peel, wrinkle, or crack, it actually makes the foam feel stronger.
The house paint I use is Sherwin Williams Interior/Exterior enamel latex paint. It's about $25 a quart and color matching options are endless. I used about half a quart of the paint for my based coat on my Halo 3 Chief. I thin the house paint with water till it flows through my airbrush well. I usually lay about 2-3 good coats. I then high light my edges with a light color like tan acrylic using my air brush. I then spray one more light coat of base house paint, this gives the edges a nice worn lighter version of the base coat and also gives great depth to the base.
Yes it black washes incredibly well with very watery washes. I build my washes up in layers to achieve the color tone I want. The house paint is also water proof as well and of course if using Leak Seal, so is that as well.
Acrylic paints are also great durability wise and I use those for all the detail painting, washes, and scratchs.
For grimy weathering in crevasse, I really love water soluble oil paints using a brush then wiping them off to the desired effect.