Recently cleaned out and painted a “cold” room in our basement. It’s located under our concrete porch. Concrete walls, floor, and ceiling. It had a bad moisture and mold problem. We scrubbed it out, cleaned every surface with bleach, dried it for days, sealed it with a rubber spray (just in certain areas), and painted it with a paint meant for garages to prevent mold and mildew, that can withstand moisture. About a week later I open the door to find this (click to see image). Is this mold? Looks like ice crystals forming on the wall. What do we do to fix this? Please help. Thanks!
Edit: Located in South-Western Ontario, Canada. Needs to withstand cold winters and rainy seasons.
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