Carl,
This is a great tip! Thanks for the advice. I'll try this today.
Regards
Tony Renshaw
>Tony Renshaw wrote:
>>
>> Gidday,
>> I would like some advice on "when is the right time to discard hardener that
>> appears to have darkened in colour, and gives off quite an odour (mind you,
>> it may always give off this smell).
>
>Firstly the discolouration of the hardener is OK but make sure it does
>not start to crystallise. My hardener always seems to smell strongly of
>ammonia but this is also OK
>
>Incidentally there is a very easy way to prevent air from getting at the
>hardener, that is to install a floating lid (we use them in the Photo
>Processing trade with all our solutions which are very prone to
>oxidation). Cut a piece of blue foam about 1cm thick and the same size
>as the inside of the hardener container - make sure it will slide down
>all the way to the bottom of the container. Wrap the foam in a plastic
>bag or cling film and place on the surface of the hardener. Dont worry
>that it is not a snug fit at the top of the container (unless your
>container walls are paralell) as the small amount of surface exposed is
>minimal. A self tapping screw in the top of the foam permits easy
>removal of the lid.
>
>My latest batch of resin has been in the resin pump for over a year
>(with floating lids) and seems perfectly OK. Unfortunately due to
>pressure of work not much building going on. With such infrequent use I
>stir both the hardener and resin about once a month and pump the
>dispenser handle otherwise it gets stiff and liable to sieze up.
>Dispensed resin and hardener gets returned to the reservoirs - dont
>panic, I used separate containers !
>
>Hope this helps.
>
>
>Regards
>
>Carl Pattinson
>
>
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