@avenali312 Yep it is a blend between a clean floor to a broken tile floor with an additional grungy dirt and water puddle overlay setup through vertex paint.
Your swift adjustments displaying open mindedness is commendable. The integration of sketchfab may put you on the bleeding edge of portfolios. This is something I really like.
Yeah, with Max SGs you'd do that by assigning multiple groups to a given face, creating blends. This scenario is pretty much the main weakness of the SG paradigm.
Did you use edge bleeding to allow atleast 8 pixels space between the edge of your UV's and the end of the texture? Mipmaps are likely to be the cause.