thistle bond-it

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plasterjfe

plasterjfe

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anyone used gypbond when dot and dabbing onto pre cast concrete? I used some knauf BETAKONTACT the equal product but found it to pull off the dabs where as the gypbond is still hard as hell?? anyone seen this before
 
I was dabbing a pre cast concrete building, the surface prep on the spec was gybond walls first before dabbing, we run out of gypbond (as in the green bond-it paint on) and used the a bucket of knaufs equal product betokontact but where we used the knauf product it did not key. i found the dabs pulled off the wall
 
Ah OK .... I have used bond it over cast concrete before and the Knauf should work as well as the bondit.

Had it completely cured ????

Was the concrete clean and free from dust, oil etc ???

rich
 
no the spec was for bond-it 24hrs then dot and dad away, the section with the knauf stuff i noticed had come off the wall and was stuck to the back of the dabs just leaving bare patches on the wall. no probs at all with the bond-it
 
I thought about dirty walls rich but every single one had come off and the walls were ok, we left ample time for cure but i can only think the product is not as good ?
 
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I understand concrete pours can be different. for in situ buildings they use a certain type knowing that direct plastering will take place. maybe it was still holding moisture itself causing it to separate.
 
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