bad keys on terminals

Tony Duell ard at
Fri Sep 15 16:51:43 CDT 2006

> > > > I would assume it's because at least one part is not totally
> > > > homogeneous and may partially separate in storage. If you take, say,
> > > > half of the contents of the container you might not be getting half
> > > > of everything.
> > > 
> > > That makes sense as one possible reason.  I'd prefer not to have to
> > > assume, though.
> > 
> > Well, apart from that, and the 'business' reason (that they sell more 
> > kits if you waste most of them), can you think of any other reasons?
> I've worked with a number of 2-part molding and casting supplies, mostly 
> urethanes and variations on RTV rubber, and they're often sensitive to 
> oxygen and/or atmospheric moisture: once you open the factory seal, they 

Good suggestion. I don't recall there being anything in the instructions 
about this, though, and there were no seals on the contains (obviously 
there were lids with rubber washers, but nothing about not removing them 
before you mix the stuff).

Incidentally, do you have any experience of the 2-pack 'synthetic 
rubbers' that Devcon (and others) make? I may well need to use such a 
product to make a roller (for a classic computer -- an HP9820's internal 
printer), and I do need to mix small amounts. The smallest Devxon pack I 
can get over here is something like 500g, and costs \pounds 30.00. I am 
going to go broke very quickly if I have to pay that out for every test 
run (I know it won''t work first time).


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