Paint

[brainbug007]

Sorry if this has already been covered but I couldn't really find what I was looking for. I'm hoping to order my grp soon and I'm trying to sort out colors. I want to do the side & back of my roadster in ali with the nosecone, arches, bonnet, & scuttle in grp. So my dilema is finding paint that I can use on the metal that I can RAL match to the grp. The only metal specific paint I can find really is hammerite but that doesn't give you a RAL value. So can I use an acrylic spray can on top of an etch primer (acrylic sprays seem to be easier to get as a specific RAL) and then use a lacquer of some sort on top to give it a nice gloss and protect it? Or is there a better way to do this that I'm unaware of?