Color your Pozis bronze

[mklotz]

I forgot to add...

If the engraver point wants to "walk" off the nut, use a Dremel with a diamond point to make a small crater in the side of the nut and put the engraver tip in that divot.

Actually, the engraver impact wrench trick can work on fairly large nuts. I have a (totally unproven) theory that the vibration makes minute fractures in the rust that help the Kroil to penetrate deeper.

On the subject of penetrating oils...

A study done by Machinist's Workshop in the April 2007 issue tested different penetrating oils to see which did the best job of removing a rusted bolt by measuring the torque required to loosen the bolt once treated. These were the results...

Penetrating oil .......... Average load

None ..................... 516 pounds

WD-40 .................... 238 pounds

PB Blaster ............... 214 pounds

Liquid Wrench ............ 127 pounds

Kano Kroil ............... 106 pounds

ATF-Acetone mix.............53 pounds

The (ATF)-Acetone mix was a "home brew" mix of 50 - 50 automatic transmission fluid and acetone.

So, if you run out of Kroil (my favorite) you can always brew up some effective home brew.