"stuart noble" wrote in message
...
On 18/09/2010 23:57, The Natural Philosopher wrote:
stuart noble wrote:
On 18/09/2010 08:58, Jim K wrote:
On 18 Sep, 08:27, stuart wrote:
On 17/09/2010 22:11, jkn wrote:

Hi Stuart

2 part wood hardener. Having tried all sorts over the years, that's
a
very strong opinion :-)

http://www.screwfix.com/prods/63540/...-Rot-Wood-Hard...


[...]

Fine, but that Ronseal stuff isn't 2-part, is it?

On reading the COSH data, maybe not, but then why the big plastic
cap on
the can? That usually contains the hardener IME.
Can't vouch for it if it's not 2 part but maybe it works well enough
with an acetone solvent

strewth....
the big plastic cap is the "handy" kettle in which to pour some
(single part) hardener (styrene) and dip your (single use) brush.....

I would have thought the acetone would attack the plastic, otherwise
why package it in a metal container?

styrene is not acetone, and acetone does not attack polythene, It comes
in polythene bottles.

Which begs the question why this Ronseal stuff, consisting mainly of
acetone, comes in a metal container.

Solvents usually do come in tins. Even if they don't dissolve the polymer
itself they still can strip plasticisers, and also polythene is not stable
in sunlight. However, this did not stop us selling IPA in 25 litre plastic
drums, but acetone is so volatile we would not have done that. I keep 'nail
varnish remover' in the fridge but it still evaporates slowly out of the
bottle cap. With Ronseal, the main reason for the tin is probably to make
sure the solvent has evaporated before you want to use it again... Same
goes for the rusty tins of plastic wood and Nitromors and the always split
caps of Araldite tubes...

S