I had exactly same problem, switched to textures (I used 1 texture for each mesh, you’ve got 4 channels there, red, green, blue, alpha - so using 1 texture I could project decals for 4 bodyparts. Hands, body and head)
There’s a checkbox in rendering somewhere “recieve decals”. I wish there was some grouping or tagging - maybe there is, but I haven’t found it yet.