rendering turns to dust

Joined
27 May 2012
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Kent
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United Kingdom
need some advice .when doing a bit of cement rendering sometimes when it sets the finish becomes dusty and dead like. i always use plastering sand with a 4 to 1 mix with some waterproofer .like i say it doesnt always do it . c ould it be the plasteriser i heard it can weaken itany advice cheers
 
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Your problem is that render sets by chemical reaction - yours is setting by drying out BEFORE the chemical reaction takes place. Make sure you keep it damp until it cures. ;)
 

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