There are a lot of threads on how the old black Girling brake and clutch reservoir repros from the old Austin Healeys BN1 cars (pic below) start to weep after a few years, so we'll skip over that -- if you have them, they'll begin to weep sooner or later. I was starting to get about a drop every week or so, and tightening up the fittings did no good. I really like the look of the old cans, as opposed to mechanically superior "new-fangled" stuff like the Kirkham cans. Finding a brake fluid resistant sealant that will go on over a weeping seal/fitting and
work is no small chore. Seal-All does, and it stopped the drip. It's basically Methyl Ethyl Ketone and here's the technical data sheet
http://eclecticproducts.com/_tds/sealall_tds.pdf So, if you need brake fluid resistant sealant, here it is.
