14-02-2020, 07:55 PM
(14-02-2020, 07:07 PM)JonE Wrote: what exactly will the difference in result be, Charles?
Electrolytic rust removal doesn't attack clean metal in any way - you can put a freshly bored block in and the machined surfaces won't be touched but the rust is removed. Acid, on the whole, doesn't leave machined surfaces untouched.
I'll acknowledge that on this head there is no "fresh" metal to risk, but with a VERY rusty item you can just leave it in all week and not worry about causing damage.