Cavu
Had the same discussion with Pro Tech, when I was trying to trouble shoot my fluid bath that I had purchased from them.
Haven't had much problem with pearl ? but I mix a fine holographic glitter (from Columbia Coatings) in it and that might be stabilizing the paint. If the saltwater swap happens you will see the results. Doing a "Sardinia" (red, white, and blue) and a Mexican Flag (red, white, and green) using the pearl for the white.
My problem child is a red (Pro Tec) that I mixed with an awesome glittered red (candy apple red?) I got from Color Rite (this is before I got the holographic glitter). You get anywhere close to 325F and it wants to run and sag.
Some things I try to remember;
Don't commit anything to memory (mixing ratios, curing temperatures, etc); write it down (preferably in a dedicated notebook).
Use a reliable temperature reference.
Experimenting is fun.
When you pooch the paint job on a jig, you have made a donation (I've made a lot of donations).
Use cheap hooks when you are starting out ? no fun when you goof on an Owner or Gamakatsu.
Jig Man
Regular artist paint brush work well. The further you are away from the jig the finer the powder but you sacrifice control and you have a bigger mess to clean up. You still have to "fluff" your paint when you are using the paintbrush.