Hi Fellas , Havent posted on here for ages and i hope your all well. Just a quickie. I mainly fit Architectural stainless etc for a living . When fixing to Mild Steel or fitting Ali locks and stuff, i have to fit a rubber barrier between the dissimilar metals. Now its been many years since i was at college and was wondering if this was to stop Electrolytic reaction ? If i have the right term for it. And if so, how long does it take for said reaction to start occuring in general ? I eagerly anticipate your wise words. Cheers to all .