If you re-deck the surface is the old deck removed? (the coping, drains etc. are flush so r no room for additional height. I also found out my wife sprayed the deck down with fresh water after work the night the deck was done. She had seen me do that to all the unfinished concrete (sub-deck and shell) and assumed it was OK. I did research last night on web and now I think maybe we washed pigment out.

I guess I am at least some at fault, the contractor said no walking on it until next day but never said anyhting about water.

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