I am in England and have the same problem. I was going to mix some red readymixed kids paint with a bit of blue to darken it and use that. Because it will dry matt, I was going to varnish it to make it glossy, considering a spray varnish as the paint is water based so wont take brushed on varnish well. Happy for any other ideas though. I also have some acrylic paints to try it with for smaller props.