Hello again,
Polypropylene and other "poly"-s are always a kind of long-chained molecules contains C, N ,O and some other elements. Plastics. Maybe they have other color, thickness, surface or grip or even trademark names like Gatorfoam, Plexiglas, ABS etc., commonly they are the same. Almost undestroyable, (except heat) and mostly very hard porous materials. I'm not familiar with "Yupo" , but surely is it comparable with ABS and Co. Maybe it has an other absorption as ABS, the best way : test it.
Ciao.
PS: you've started a new topic.Unintentionally?
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