I have just been away for a few days so missed the beginning of this tread.
For several years I have been adding gas from my blowtorch to the open can
before firmly replacing the lid. Excluding the air in this way means my part
tins of paint are always usable with no more than a thorough stir. Wiping as
much paint of the rims of both the lid and the tin also helps.
Last weekend I used some very old lead based matt black from a gallon tin I
had not opened for at least 7 years. It took a fair bit of stirring but had
no skin and gave a perfect result. I originally bought the tin of paint from
an MOD surplus dealer for a fiver after the RAF had scrapped it for being
out of date, the use by date on the tin was 1990!!!
With sufficient air space in the tin the oil paint will skin over
anyway, this will protect the remaining paint and depending on
the type of paint you are supposed to either cut off and remove
the skin then thoroughly stir or stir in the skin and then strain
through a nylon stocking or purpose made paint strainer.
From the Wirral Peninsular.
I remember many many years ago seeing on TV a system of lids for glass
jars with a self sealing valve on top and a sort of hand operated vacuum
pump. The idea being you removed any air after putting back on the lid.
Rather like canning works, but without the heat.
It was short term storage of edible products - and may well have been
before most had 'fridges. But like many such things on TV, never saw it
*Toilet stolen from police station. Cops have nothing to go on.
Dave Plowman email@example.com London SW
On 05/07/2011 13:46, firstname.lastname@example.org wrote:
What's the deal there - I never know what to do for the best when I come
across skin on paint. I usually make a judgement on whether it will
actually ever stir in, and if not (eg if it's an eighth of an inch of
hard dry crust!) I remove it.
What does it do to the quality of the paint itself? Would the
underlying paint become more (or less?) concentrated from repeated
removal of skin? Or is the skin layer identical in quality/content to
It depends how thick the skin is, if it is thin then usually the
oil has not separated and you can just lift the skin off, If it is
thick and sat on separated oil then this oil should be stirred
back in and then strained to remove the bits of skin, this way you
don't lose the integrity of the paint.
Oil paint is not resoluble so you have to remove the skin but
sometimes the skin is so thick and hard the paint underneath will
need that bit of medium that's still stuck to the base of the
Oil paint will become concentrated during use anyway as the
solvents or oil evaporate.
You can however add a little boiled Linseed oil if the paint
appears far too thick to be satisfactorily usable.
From the Wirral Peninsular.
Without stirring it (or maybe after first stirring very carefully,
without breaking the skin), you decant most of the paint off into
another container. You then scrape off the sludge from the inside of the
lid, add it to the paint you have decanted, and stir it in well.
After you have used the paint, if there's still some left, you can pour
it back unto the original tin until the next time you need it.
Once opened, I suspect that a re-sealed tin often allows small amounts
of air to get in. Storing it upside down probably helps the lid to be
absolutely air-tight - just make sure it doesn't leak!
On Tue, 5 Jul 2011 14:00:08 +0100, Ian Jackson wrote:
Gawd what a faff and lots of containers all mucky with paint...
See other comments about tins stuck to shelves. Think I'll stick with
cleaning lid rim and can carefully and tapping the lid fully home.
With maybe an inversion to get paint around the inner edges but store
the right way up.
That's the container (a large ex-pickled cabbage glass jar works for me)
you use to give your brush its first clean with white spirit. You then
leave the contents for a week or two, until the paint settles into a
sludge, then decant off the white spirit for re-use. Put the jar away
for a few months, until the sludge solidifies, then remove the sludge,
and dispose of it as a solid lump. Re-use the jar for brush cleaning
Don't you line your shelves with sheets of newspaper?
I've never had a skin form in any tin stored upside down.
Skin forms because refitted lid rarely seals perfectly and
you get slow air exchange, but it does seal much better if
you store the tin upside down (and is noticably harder to
By the way, I noticed on the instructions on a tin it
said "do not open with a screwdriver". So what are you
supposed to use? I used a screwdriver...
[email address is not usable -- followup in the newsgroup]
On Tue, 05 Jul 2011 21:11:59 +0100, Andrew Gabriel
Smile. Get to know the staff. And ask nicely in a Johnstone's decorator
centre. And they might give you a special paint tin opener.
That's what I did. Unfortunately not one of the nice Johnstone's branded
ones as they had run out, but a not so nice old Dulux one. Can't win 'em
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