This is a 1:40 scale camarasaurus by Safari Ltd (that's a 40mm figure next to him). The original paint job was ok, just a two-tone blue-gray, though, it was somewhat glossy (not as bad as the original Safari Ltd figures, but not as matte as the newer ones.) I originally purchased the dino a few years ago with the intention of repainting it.
PrimingI used the Army Painter primer on this figure. Then I followed that up with the Testors Flat Black to kill the AP gloss. I think it'll be cheaper (and just as effective) to use Testors Flat Black first, followed up by a brushed-on layer of black craft paint to get rid of the tackiness. I used the second method on a gryposaurus that's on the work table right now. The primer/paint on both figures seems to be holding up well.
I hadn't bought any new dinosaurs in a while, but the newer Safari Ltd figures are made of a slightly harder and much more matte material. It's still a little bit tacky with a coat of Testors primer, but not nearly as much as the old glossy figures.