You may have to put on some gloss black anyhow. Often times metallic particles won't lay down directly on plastics. I had problems with this even on fiberglass and with gold metallics on gel coat. different product, but it's a semi-educated guess. It may be the reason those other guys are mixing it all together if they are putting it direct on plastic. This may or my not apply to this paint, I don't know. Obviously metallics with this small of particles have to be mixed six ways from sunday, It clumps together and gives you a rough finish. I've found that they also don't keep well. Six month old stuff I could only use if i took back to the supplier and had it mixed for 30 minutes or so and year old stuff was unsalvageable. These were all 2k automotives. Createxx claims to use automotive pigments, just in their own resins so I imagine a lot of this probably still applies.