Parkerizing

[Bcwitt]

Can you park over blue, or must that be pretreated somehow?

 

[BBBBill]

I don't believe so, but some folks blue over Park. The Park has to be fresh with no oil in it for that to be successful.

 

[dfariswheel]

I think you can park over blue, but for best wear and adhesion, park needs a bead blasted surface to give it a "tooth" to bond to.