does it give a coat that could peel off or does it actually penetrate the

surface of the Titanium and harden that surfacing and to

what depth.

George the thickness of a nitride coating is very thin, not more 
than .001 in. at most. Steel nitride is considered a "no size change" 
process. the part is finished before application. Polishing is 
the only post process done. On steel the finished product is 
only .0002-.0005 in. thick.
Bill Jepson

 
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