Does Brownell's oxpho blue go bad?

[Retch]

Hey Gang....quick question for anyone who might know. I bought some oxpho blue last year to touch up a couple of blued handguns and this stuff worked great. Fast forward about a year and I pulled it out touch up a scratch and it didn't seem to "stick." Anyone know if this stuff starts to deteriorate after it's been exposed to air a few times? I don't have any other spots to test it on...I'm wondering if the problem is this particular gun's finish or if I need to bite the bullet and just order another bottle of this stuff. Thanks.

[HisSoldier]

I did some research on acids a while ago, and they do lose strength sitting. I didn't know that. Oxpho is acid based. One plus one may not equal two in this case though.

[Dfariswheel]

The easy thing to do is contact Brownell's and tell them.
In all likelihood, they'll send you a fresh bottle free.