Types of plastic used to make powders for coating

[atfsux]

If this has already been asked and answered, please just direct me to the thread where I can read about it. But my line of inquiry is this;....

Apparently there are only 2 types of plastic used for making powdercoat powders: epoxy or polyester. Some products are a blend of both.

I know most of you who have been doing this a while have a preferred brand or product that you use. But do you happen to know what your favorite powder consists of? Is it polyester, epoxy or a blended product?

It is well known that some colors tend to coat more consistently or completely. But I wonder if the observed lack of performance may have been due to the powder consisting of one type that may not work as well for our purposes?

So I hear great things about Smoke's powders, as well as Eastwood,...while many find the Harbor Freight stuff to be disappointing. Have we discovered which plastic these powders consist of?

And when it comes to the notoriously bad colors like yellow or white, that often don't cover well,...have you found any brand that does better in those colors?

[jsizemore]

Here's eastwood;

https://www.eastwood.com/images/library/16307.pdf

[atfsux]

Here's eastwood;

https://www.eastwood.com/images/library/16307.pdf

That is interesting jsizemore, thank you. I see in that breakdown that the pigments to colorize the powder are added separately to the plastic powders, and that it seems the plastic only becomes fused with the color upon baking and melting all together. I had kind of assumed that the plastics were colorized first, then ground into powder. Hmmmmm. That tends to explain (at least to me) why liquid expoxies cover in color so much better in the lighter shades than the powders do.

Anyone else have a similar breakdown on other powdercoat powders? I'm curious which are 100% polyester and which are 100% epoxy.

[nueces5]

I have only used polyester, and in my limited experience, I am impressed that the lack of coverage has a lot to do with the difficulty of static cling. The clear powder I use has very good adhesion. The blue powder I use has horrible adhesion. So I use a white powder for my boolits that adheres pretty well, and when the boolits come out of the oven white, they cool a bit and go into the pot of blue powder. Some of it sticks and I put them back in the oven. If there is any part of the boolit that is not white, the blue finishes it off.