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Ok, strange one. My customer was advised to chalk his walls. He has removed the old tiles and adhesive in the kitchen which, luckily, has left the walls in a fairly straight condition. But he had bought tubes of chalk and kind of applied it like you would with plaster to the whole wall. I have just used an aycrlic primer diluted 1:1 as per instructions, but this has weakened the chalk meaning I can basically scrape it of with my fingers. Any advice please? Using bal green star, 150 x 150 ceramic (cheap) tiles. Thank you