Hi,
We recently had charcoal coloured through concrete for our backyard. The first section was poured 3 weeks ago. We are still waiting for it to be sealed. We noticed white patches in concrete a few days later. Our concreter told us it was salt and it will be gone after he seals it.
The second batch was poured last Tues. He sealed it last Friday. Not sure if he did 2 coats. He was in and out in 40mins, tops. There were patches of what seems like sealant. The concrete area also looked patchy.
Here are some photos:patchy concrete, this is after sealant
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Is this normal?