Acrylic enamel or acrylic lacquer ? The laquer dries the fastest. It needs a clear top coat.
The enamel is like
oil house paint it needs.....a long time to dry.
As far as the E-Bay stuff...It's an additive. I reckon you could use it with acrylic lacquer and a clearcoat. It's meant for 2-pack but 2-Pack is just a pigment covered with a you-beaut 2-pack clear......you might get away with it.
I'm using a silver "base coat tint" to paint the chassis. So it's now a "base coat".. the coverage is there. So I can only guess that if you mix it with the appropriate colour OR clear. You will get a prety good effect..............basically...wack it in the clear and see what happens !