Out of date multi finish

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glowkeeper

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Did a job last week where the customer had 20 bags of Thistle multi finish that had a summer 2012 date on them. The fella running the job chose to order new stuff, which seemed sensible, but I couldn't help thinking it was all such a waste (especially given that I opened a bag and it all looked to be in good nick). Anyone had any experience of out of date multi? Is it unusable?
 
Never use it if its out of date, the punishment can be severe, either wont set or it sets too fast, you can tell by the stiffness of the bags if its old also it feels sandier to the touch. Skip it ecologically of course.
 
As John says i wouldnt touch either .... only causes problems ..

Like my local wickes used to store pallets outside after delivery - wasnt out of date but went off at a rate of knots .. stuff recently has been superb .. like butter

Has a use by date for a reason !!
 
You can use plaster that is a couple of months out of date because when it is bagged, they always add a margin of uncertainty to ensure that it is still useable up to the expiry date. This margin is usually 1-2 months after the expiry date.

During the manufacturing process, gypsum is heated at a high temperature to form a new compound that contains less water molecules. In essence, the bagged plaster is thirsty for more water to return it to it's original state and will therefore begin absorbing moisture from the environment where it is stored. After extended periods, bagged plaster will become stiffer due to this moisture absorption and may even clump together from the moisture partially reacting with the thirsty plaster.

Plaster also has a proportionate amount of retarder to increase the working time. During the warmer months of Spring/Summer it will contain more retarder and during the cooler months of Autumn/Winter it will contain less retarder. Therefore, if you try to use a batch that expires in Summer during Autumn/Winter, you will find that it hangs around for much longer because those batches have more retarder to increase the working time. The opposite happens for batches expiring in Winter that are used in Spring/Summer: they set too quickly because they contain less retarder.

To conclude, you should always use expired plaster with caution :)
 
Obvious caveat , depends on how its been stored ,ambient temps, etc, best to bin it for decent work. Do not rely on bg..
 
If its out of date throw it away! Its not just that its gone past the date it's where has it been stored for the last 7 months or however long? In a damp shed or garrage probably. Throw it away every time
 
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You can use plaster that is a couple of months out of date because when it is bagged, they always add a margin of uncertainty to ensure that it is still useable up to the expiry date. This margin is usually 1-2 months after the expiry date.

During the manufacturing process, gypsum is heated at a high temperature to form a new compound that contains less water molecules. In essence, the bagged plaster is thirsty for more water to return it to it's original state and will therefore begin absorbing moisture from the environment where it is stored. After extended periods, bagged plaster will become stiffer due to this moisture absorption and may even clump together from the moisture partially reacting with the thirsty plaster.

Plaster also has a proportionate amount of retarder to increase the working time. During the warmer months of Spring/Summer it will contain more retarder and during the cooler months of Autumn/Winter it will contain less retarder. Therefore, if you try to use a batch that expires in Summer during Autumn/Winter, you will find that it hangs around for much longer because those batches have more retarder to increase the working time. The opposite happens for batches expiring in Winter that are used in Spring/Summer: they set too quickly because they contain less retarder.

To conclude, you should always use expired plaster with caution :)
It's seven months old, how r******d is it ?
 
Couldn't have said it any better minh!!
You can use plaster that is a couple of months out of date because when it is bagged, they always add a margin of uncertainty to ensure that it is still useable up to the expiry date. This margin is usually 1-2 months after the expiry date.

During the manufacturing process, gypsum is heated at a high temperature to form a new compound that contains less water molecules. In essence, the bagged plaster is thirsty for more water to return it to it's original state and will therefore begin absorbing moisture from the environment where it is stored. After extended periods, bagged plaster will become stiffer due to this moisture absorption and may even clump together from the moisture partially reacting with the thirsty plaster.

Plaster also has a proportionate amount of retarder to increase the working time. During the warmer months of Spring/Summer it will contain more retarder and during the cooler months of Autumn/Winter it will contain less retarder. Therefore, if you try to use a batch that expires in Summer during Autumn/Winter, you will find that it hangs around for much longer because those batches have more retarder to increase the working time. The opposite happens for batches expiring in Winter that are used in Spring/Summer: they set too quickly because they contain less retarder.

To conclude, you should always use expired plaster with caution :)
 
Send it back to BG,and they will rebag it,,,,, and they will punt it back out as unifinish:rolleyes)
 
never use saves your back always throw it away serves the idiots rite for buying 20 bags then waiting 7 month to get a spread in bet hes attempted to do sum diy with it then realised he needs a pro hah
 
You can use plaster that is a couple of months out of date because when it is bagged, they always add a margin of uncertainty to ensure that it is still useable up to the expiry date. This margin is usually 1-2 months after the expiry date.

During the manufacturing process, gypsum is heated at a high temperature to form a new compound that contains less water molecules. In essence, the bagged plaster is thirsty for more water to return it to it's original state and will therefore begin absorbing moisture from the environment where it is stored. After extended periods, bagged plaster will become stiffer due to this moisture absorption and may even clump together from the moisture partially reacting with the thirsty plaster.

Plaster also has a proportionate amount of retarder to increase the working time. During the warmer months of Spring/Summer it will contain more retarder and during the cooler months of Autumn/Winter it will contain less retarder. Therefore, if you try to use a batch that expires in Summer during Autumn/Winter, you will find that it hangs around for much longer because those batches have more retarder to increase the working time. The opposite happens for batches expiring in Winter that are used in Spring/Summer: they set too quickly because they contain less retarder.

To conclude, you should always use expired plaster with caution :)
do you work for BG ?? lol
 
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