any ideas?

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nickelarse

Private Member
did some ocr for someone a few weeks back outside. was some old brickwork so i put a light coat of microgobetis over it first. left it a few days and then floated it out. blokes just called me and said that it has hairlined a bit and in places sounds hollow. any ideas as to why?
 

nickelarse

Private Member
well yeah i gathered that..... just trying to think why it would have done. weather was decent etc.
yeah hes paid me but wants me to go back and have a look
 

bodplasterer

Active Member
I used ocr back in jan and didnt rate it, it seemed like it would be the sort of material to do exactly what your describing Nick and I thought the all idea of using a bagged render was that if there was any problems like that you call upon the manufacturer?
 

nickelarse

Private Member
I used ocr back in jan and didnt rate it, it seemed like it would be the sort of material to do exactly what your describing Nick and I thought the all idea of using a bagged render was that if there was any problems like that you call upon the manufacturer?

i imagine theyll tell me to do one coz i put micro on the wall first....
 

FreeD

Private Member
So many possibilities m8, I regularly get fine hairline cracks in s/c nothing you can do about it and that is all OCR is at the end of the day. It shouldn't sound hollow though, sounds like what you did to prep the background didn't work.
 

malc

TPF Special Forces
am i right in thinking that OCR had health problems, with one of the added chemicals, and is now banned in california ?
 

henry

Private Member
lot of suction in old brickwork , how long was it before you started to float off nick.
 

nickelarse

Private Member
lot of suction in old brickwork , how long was it before you started to float off nick.

the micro kills most of the suction. thats why id used it for the bricks. we put on about 9ish for a couple of hours, finished about 5.
 

plasterjfe

Private Member
the micro slows the suction and is good for repellant backgrounds but one prob with it is - if the bricks are really smooth and then you micro also you end up with a real glossy coverage of micro and gear can slide on it. I would suggest if it sounds hollow that this could be the case - it wasnt adhered but set firm. the crack could be something to do with it being free from the surface.

sometimes its better to stick with rendaid i guess
 

nickelarse

Private Member
yeah they werent smooth bricks, but im guessing what youve said is right that its set but not keyed into the bricks properly for some reason...
 
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