Good post on painting! I've been using House of Kolor stuff for years and love it. I prefer the UFC-35 Flo Klear. Seems to have even more gloss than the UC-35 if you can believe that! Lays out real good, and buffs up well.
APO is a HOK adhesion promoter that is supposed to work well on plastics. APO-1 and APO-2 is how they are rated one is for plastics and the other is for non plastics. I can't remember which is which right now.
I've had lot of fun with the marbleizers and pearls. I recommend HOK stuff to anyone learning to paint, it's marvelous stuff and very user friendly. I wouldn't recommend using the APO's to promote adhesion between marbelizer and top coat clears as it doesn't work nearly as well as SG100 Intercoat clear. I use SG100 anytime I'm doing tape overs, art work, marbelizers, works best with RU 310 fast reducer. For those that haven't used this product it dries kinda funky and is best wet sanded as it tends to ball up in the sandpaper if dry sanded. No it's not a catalyzed clear or a top coat clear either just reduced 2 to 1 like most of HOK stuff.
anyway that's my 2 cents on painting. I love it!