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I have a small patio (10'x6') with painted (oil based) concrete.

It has a slightly uneven slope resulting in standing water with heavy rain.

I would like to add a small ramp/slope to the top of the patio.

Can I pour a new layer of concrete over the old painted layer with a new slope?

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    Not unless it's either substantial enough to be robust as an independent layer, or if it's a material designed to be used in a thin sheet. However, that patio's small enough that I'd consider raising it. A few levers would lift one side, and you could backfill with sand to a new level. – isherwood Jul 24 at 20:58

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