I think it means "Non Metallic Metal" - a similar set has been released by Scale 75 not long ago.What does NMM refer to? I went to the site but couldn't figure it out. Not sure what colour or problem this set is meant to assist with.
Colin
That would mean using metallic paints to me, the opposite of NMM.Usually referred to as NATURAL METAL FINISHES.... NMF.. Armor and Fantasy builders..