Discuss 4 Year Old Gyvlon (anhydrite) preparation advice in the Canada area at TilersForums. The USA and UK Tiling Forum (Also now Aus, Canada, ROI, and more)
Many thanks to those who have replied. It has helped. I guess it's an area both of differing experiences / opinion and maybe a number of different ways of achieving the same thing - you can see how I could get confused.
But I will do the light grinding (glad to hear 1 mm may be more than needed) and use probably P51 as the original screeder suggested, or ask carefully why the profession that I will have tile the floor, thinks another primer is better.
I'll also have a decoupling mat and see if the tiler agrees on a gypsum based adhesive for the mat and then cement based above mat to stick tiles with.
Can't do much more.
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