That works perfectly! Thank you so much sidenimjay!

I think my question may have been unclear. I'm trying to assign multiple materials to a single mesh. In Substance Painter it reads it in as texture sets. I've tried layers to no avail, as well as the Material SOP in several ways and I cant seem to crack the code! Thanks for your time though SreckoM!

A quick question, how on earth do you export meshes from Houdini with texture sets for use in Substance Painter?