Pearlx is a powdered product similar to both pearl powder and hi lite powder. Its compatible with the plastic we use and with powder paint. Because it is purely an aftermarket type of product, its a product that requires some getting used to in both venues.
Used in plastic certain colors of the pearlx tend to be extremely strong and if used as a hi lite will actually make that batch of plastic a pearl instead. Other colors require quite a bit of it to create the hi lite effect. The same holds true when blending into powder paints. And because the differences between how people measure out this product erases any hope for a standard measurable amount. In both the paint and plastic it creates some very new effects that our typical products cannot if you are willing to experiment.
Some colors of pearlx are fairly clean and give you a nice hi lite type result while yet another similar color hands you a pearl effect using almost an identical amount. Some colors have a lot of strong dye in them and will change the color of the plastic in a blink. Bottom line here is that you have to use them yourself to know which colors do what and how much of each color is too much vs just right. The powders are easiest found in "sets" of colors, I think 16 to a package, and there are a few different sets available. The stuff can be gotten over the internet but I recommend heading to a craft shop that carries the stuff to look at it first hand because monitor colors can fool you. As mentioned Hobby Lobby and Michaels are a couple of better places to see the product but larger and better fabric stores with a strong hobby and craft section will carry them too. Internet would be my last option.
On the topic of metal glitters and microwaves the answer is simple. NOPE. You can use it in powder paint and it can be heat cured in an oven. Stick with heat proof or resistant polyesters in the plastic.
