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PostPosted: Mon Dec 04, 2017 8:02 pm 
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Mr. Grumpy

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Just curiosity really

When using rapid-set tile adhesive and the workability starts to go off, can you add water to increase workability time?
I usually dump it but wondering if its always necessary and maybe could squeeze about 10-15mins out of it?


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PostPosted: Wed Dec 06, 2017 2:24 am 
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I tried that a while back, mate just bin the lot, lumps get in and it's all downhill from there.
You can't trowel it out, and as you pick the clumps out the rest is setting/going off
A clean bucket and a fresh mix will save labour time over £££ cost of product.

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PostPosted: Wed Dec 06, 2017 9:25 am 
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Duck_Tape wrote:
I tried that a while back, mate just bin the lot, lumps get in and it's all downhill from there.
You can't trowel it out, and as you pick the clumps out the rest is setting/going off
A clean bucket and a fresh mix will save labour time over £££ cost of product.

Cheers
James


Thanks James. Yeah that's what I've been doing. I'm not a fan of rapidset as I work too slow, especially when many cuts involved.

I found you can squeeze out a bit of extra time with those quick setting morters but they nearly set as you mix it.


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PostPosted: Wed Dec 06, 2017 10:18 am 
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Anything that's formulated to set quickly will usually achieve that by a chemical reaction.

If you interfere with the chemical reaction you will almost certainly weaken the finished product in some way.

I don't know about tile adhesive, but I do use Plaster of Paris to make small sprig moulds (for clay), with small moulds I can get away with it but if I was making large moulds for repetitive use such as slip casting it's absolutely imperative that the correct quantity of water is used, anything else will lead to a poor mould.

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PostPosted: Wed Dec 06, 2017 10:28 am 
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I think you are best just mixing smaller amounts.


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PostPosted: Wed Dec 06, 2017 12:01 pm 
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Or just use a standard set adhesive which gives you a pot life of about 3 hours

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