Jason, I use alot of Rustoleum products and have had great success with them, but I use Dupli color primer almost exclusively, and I especially like the rustoleum 2x clear it has a really nice gloss to it, but I agree with Andy I would stay away from the self etching primer, it has acid in it to etch metal so it probably would damage the plastic. Plastikote or Duplicolor primers are your better choices. You can get some plastic spoons and test different variations before you paint your project, that's what I do. Hope this helps!!