On Jan 14, 10:31*pm, "Dave Liquorice"
wrote:
On Thu, 14 Jan 2010 13:50:06 -0800 (PST), NT wrote:
Ready mixed also have a shelf life, dry powders don't provided you
keep
'em dry.

dry powders do have limited life oncce open, unless you seal them up
airtight

Can't say I've had any problems with dry powder filler that must have
been(*) at least 10 years, old probably nearer 20, stored in a dry
enviroment in it's cardboard box with the paper bag just folded over
a few times. Not just a one off either as I've also used stuff that I
bought in the mid to late 80's in the last few years. The tube of
ready mix was next to useless a year or so after opening and wasn't
very nice to use either, too gritty, even when freshly opened.

its certainly an issue with plaster


NT