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Dumbo
Harry said prime
Discuss Tiling concrete floor and UF heating in the Canada Tile Advice area at TilersForums.com.
Steve, the reason I stopped using these boards is because the need to prime face and underside. Yes the boards are cheep, but the time and space needed to prime and then completely dry let them dry is uneconomical.
The unprimed boards have added to the failure and not fixing to a flat surface, SLC, was the first mistake.
How you proceed now is between you and your old / new tiler.
I would be very surprised if a new tiler is happy to continue the work knowing the problems.
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