Where can I find showerproof skintones for The Blob bodyshape?
The Blob by synapticsim

A lot of Synapticsims' items are very spesific to their site and are probably more meant for storytelling purposes than straightforward gameplay (making showerproof skins for all their projects would be a huge project, I imagine - especially since everyone has different skin preferences), so if there aren't any showerproof skins already available, they probably don't already exist elsewhere.

There are tutorials for making showerproof skins, though.

It’s just that many of the figures on this site are mostly not human, but fantastic, and they don’t really interest me, but this figure is human, and therefore is of interest to me.

The Blob is a character from X-Men. He isn't actually intended to be a proper bodyshape.