Have you considered Robar?
Roguard or NP3? Roguard I think much more durable than Black T; had roguard on a Colt and BlackT on a P-12; BT peeled in the box in shipping.
NP3 is another of their proprietary finishes and is extremely durable; comes out a sort of pewter grey color which I think is sexy, and even better with some surface prep before refinish. Their service is great too.
Cheers,TF