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Originally Posted by spenny  im tiling onto existing tiles with b&q ceramic |
What's underneath the existing tiles? You will be looking at something like BAL CTF3 with admix 1 if the existing tiles are glazed or maybe Mosaic-fix. For Ardex adhesives try X7G Plus. All these have about 5hrs in the bucket.
Make sure you do adequate prep of the existing tiles to ensure they are secure and clean/degreased.