I've never tried this myself... but its just a though I had that you might want to try. Prime all the pieces with a flat grey (from a spray can) and then brush on alot of light coats with the apropriate color. I've used Acryls for a while and i get decent results with it. The trick is very light coats. I've just recently started using Tamiya paint after a long hiatus and I have to agree with Less than Super Ostrich it does RULE! But I think i'll still continue to use Acryls together with Tamiya.