In article ,
newshound wrote:
But what "finish" are you using on your stuff? Provided it is
sufficiently impermeable to oxygen, the rate of attack from "behind"
will be very small. The Victorians knew how to do it, you can still find
lacquered brass that has not corroded where the lacquer remains
unscratched or has not flaked off. The lacquer itself darkens because of
oxidation so the colour changes somewhat.

While it's true that a factory applied lacquer seems to last much better
than anything I've tried as DIY, I've not known of any that lasts 100
years or so outdoors. ;-)

--
*Toilet stolen from police station. Cops have nothing to go on.

Dave Plowman London SW
To e-mail, change noise into sound.