I got a pad of translucent Yupo a while back and gave it try again today. Yupo is a smooth polypropylene “paper” made for watercolor. It looks like vellum, but at 140lb, it’s thicker than the vellum I’ve used before. It accepts paint completely different than any paper I’ve tried because there is no absorption. I’ve noticed that you have to be even more mindful of the order in which you apply paint than normal because additional layers of paint sort of push previous layers out of the way. Like a dry erase marker.
I practiced with India Ink on Yupo as well.