[8Ball]

With this kind of response the choice is easy... "Birchwood Casey Super Blue". Thanks to all for responding and thank you MemphisMachinists for the recommendation of "tool black", I will research that product before I order.

Best Wishes To All: Mike

Check these out: http://www.brownells.com/.aspx/pid=4942/Product/SUPER_BLACK_INSTANT_TOUCH_UP_PEN

and: http://www.brownells.com/.aspx/pid=24775/Product/PRESTO_reg__GUN_BLUE_PEN

I have not used this myself, anybody try one of these??