If you are talking about the outfit I think you are talking about they are/were three or four guys in partnership doing business out of a garage somewhere in the vicinity of Phoenix, Arizona. They were using epoxy colorated yellow. It was reported at one time that they were expanding into N-Scale but I don't recall ever having seen anything.
I say "are/were" because the last I heard of them--and this is several years old--they were in trouble with them thar pesky Infernal Revenue Service folks.
Again, if we are referring to the same outfit, their HO-Scale line of merchandise was sold exclusively through hobby shops so if they are out of stock every place you have checked and have been for some time then I would venture that it is a safe bet that they ain't doin' business no more!