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Thanks for that, I've tried various masonry bits, to no avail, so God knows what's under the top screed.....I did manage to get one hole drilled out, but obviously one is not enough........

Thanks for that.....I've used this stuff before, but wasn't sure about it sticking to porcelain........

In the process of installing a downstairs toilet, and just discovered that I can't drill through the concrete floor......a hammer drill just won't touch it......I'm told that now days a lot of plumbers use a silicone product to stick the porcelain down.......what's the best stuff to use please ?