Site conditions are 1/2" cement board over 1/2" plywood subfloor.
Application is ceramic floor tile.
I bought pre-mixed thinset at HD - against my own judgement but I was tired and wanted to save some time.
Used 1/4" x 1/4" trowel, and installed about 50sf of tile.
48 hours later, the thinset still wasn't dry.
The tiles lifted easily (there was adequate thiset applied, the stuff just didn't dry). Threw tiles away and bought more. Scraped the thinset off the cement board.
Returned the used bucket of pre-mixed thinset to HD for full refund (they advised a number of ppl are having the same experience with the stuff).
Anyway, what was left on the cement board was only a "film" of the pre-mixed thinset which within 2 hours was thoroughly dry. If you run your fingers across a new cemnet board (off the shelf) it feels smooth. With this "film" they now feel somewhat "rubbery" - not sure how elese to describe it. They are still smooth (flat), the film is dry, but you can defintely feel a "traction", as if you troweled some mastic onto the board and then scraped it off before it dried.
Anyway, sorry fo the long winded description, but my question is - do you think I need to replace the cement board, or can I trowel over it with thin-set (which I will mix)?
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