.380 Body Guard touch up blue rear sight

[MEM1961]

Hello, I am trying to touch up the bluing on a .380 Body Guard factory rear sight.
I've tried Brownells oxpho blue and Birchwood Casey Super blue.
Neither one has worked.
I've polished and thoroughly de-greased the sight before trying .

[dfariswheel]

A much better cold blue for sights is Brownell's Dicrophan T4.
Unlike other cold blues T4 turns steel BLACK, not blue, and it seems to be more durable then other cold blues.

Usually the reason for cold blue failure is that you don't have the steel really clean, and you can't over-clean.

I recommend giving the part a scrub with hot water and a kitchen soap.
Rinse and dry with a hair dryer (Note: Hair dryer, NOT torch or heat gun).

Then flush and scrub with Acetone and a solvent proof toothbrush...M16 brush is good.
Acetone doesn't leave any residue like even lacquer thinner does.

Let dry, then give it a good flush with 90% alcohol and dry with the hair dryer until it's fairly hot.
Apply the T4 with a Q-tip.
Allow to work, flush with water, dry, flush with alcohol and dry, apply T4.
Repeat until you have a heavy durable coating.

Rinse WELL with water, flush with alcohol, dry, apply a lube to prevent rust.

I've found that unlike most cold blues T4 won't start to pool after a couple of applications.

[tlay]

I have never had a problem with Oxpho bluing not working when done properly. Are you sure that the sight is not stainless? Try a magnet on it to see if it sticks, if it does you are ok. Try heating the part after cleaning it with alcohol. Heat it until it is warm, not hot. Then try the Oxpho. Apply the bluing then wait 1 min. Use 4/0000 steel or bronze wool to buff up. It may take 5 or 6 coats.

[MEM1961]

First of all thank you fir your helpful in sight : )
and suggestions.
I found out the S&W bodyguard sights are stainless with nitrided coating.
I guess Ill try Wheelers ceramic coating and update you all with the results.