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Sooo ----- pushy colors are heavier in particle size, less finely ground, and they quickly sink to the bottom of a puddle, spreading out along the slick surface of the YUPO. When mixing just 'pushy' colors together, they get along, but when put in a puddle of finely ground color, like a phthalo or quinacridone color, WOW!!! Lots of action.
Click on photo, and you can see the 'pushy' color effect on the side of the red ship. I used only pushy colors in the sky because I wanted it to stay put and be as smooth as possible. (This was before the days of using a foam roller to smooth the colors on YUPO.)
All cobalts, most earth pigment like siennas and umbers, and cerulean are 'pushy.' There are lots more, so you'll have to try your own paints in puddles of phthalos or quinacridones to see how they behave on YUPO. Once you know what ones work against each other, then you can make good choices about the effects you want to happen on YUPO.
"DEEP SEA DREAMS" Transparent Watercolor on YUPO 25 x 19"