On Jul 5, 10:15*am, "john brook" wrote:
Someone I know puts a couple of very thin plastic sheets (cut up vegetable
bags from the supermarket)under the tin lids of tins of varnishes, paints
and glues that come stored in tins.

It makes the lids come on and off very easily and he claims they act like a
'washer' and hence give a more *airtight* seal. *But since air passes
through plastic bags (why long life bread is packaged in 'silvered' plastic
bags) albeit slowly, would this be worth doing?

Make sure lids are on tight and just store the tins upsiide down. End
of problem.