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Thanks for that. Very helpful. I actually got a response from Mapei shortly after posting. I emailed them this morning, but didn't expect a response so quickly so credit to them. Their reply stated: "In answer to your query you can bond directly to the concrete floor without sealing it...

I'm about to tile a 1950's kitchen concrete floor using Mapei Super flexible adhesive. I'm laying ProWarm boards first using the same adhesive and then the tiles. I'm got some Bostik Concrete Sealer but I can't establish if it's suitable as a primer or not. Can anyone confirm? I want to prime...