"dpb" wrote in message ...
On 12/17/2013 12:19 AM, DoN. Nichols wrote:
On 2013-12-15, wrote:
On 12/15/2013 9:26 AM, Lloyd E. Sponenburgh wrote:
...
Neither have I had any paints heat from shaking, but it is possible
with
a natural vehicle paint, it's just not the aluminum causing the
problem;
it could happen with any linseed or tung oil paints. As you mentioned,
your rags are evidence of that.
I'd think it _highly_ unlikely the actual "accident" described actually
happened for the ascribed reason in the tale...
There's nothing that's _that_ chemically reactive there that simply
shaking even with the introduction of atmospheric air is going to
initiate that much of a chemical reaction to produce that amount of
pressure rise.
Not saying anything about the mechanism, but it *does* happen.
Here is a report (from some not very specific time in the past):
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http://www.handymanclub.com/connect/forums/aft/40499
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I've got some new old (Co-op brand, even 
) Al paint still around --
so I went and looked at one. There's nothing on the cans about not
shaking. I've not used a lot but did a little touchup with one a few
years ago. AFAICT they're still as good as new despite the age as far as
appearance in can and behavior in use goes. I didn't drive to town to put
one on the paint-store shaker but I did put it on the homebrew vibrator
I've cobbled together here out of an old combine pittman sickle drive.
It's not as fast and has a longer stroke compared to real shaker but does
get the stuff off the bottom...I don't remember noticing any pressure
after that when opening it (but then again I wasn't looking for any as had
never heard the stories/warnings).
I don't know if there is more than one type of Al paint where there's a
significant difference in the makeup or not. I'd guess these go back to
around the late '70s/early '80s -- from the stuff in the old wellhouse it
looks like Dad bought out a bunch of the stock from the Co-op when it
closed the retail store in town but I'm not sure just when that was altho
it's been quite a long time ago now...I looked but didn't see anything on
the can that indicated a date -- even a tm or c on the label printing.
There's a manufacturer's mark which likely has a date in it but it's coded
to where can't decipher which letter/number(s) might be a year.
I'd like to see a real explanation--a quick search on manufacturers' sites
didn't bring anything to light.
--
Only precaution about shaking aluminum paint from
http://www.paintdocs.com/webmsds/web...rod no=B59S11
"Lightly stir before use. Do not shake with mechanical shaker or
overly agitate, as a dull, non-uniform, mottled appearance will
result."