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Is the surface corroded or simply has a lot of minor changes in height or holes in it?
Is the surface horizontal or inclined/vertical?
How long do you want the surface to last, how flat does it need to be and is in inside or out in the weather?
Does the surface need to take any loads? Does it need to be cosmetic in finished appearance and will it be exposed to any contaminants or chemical attack?
Can the surface be 'boxed on the sides' to allow a self levelling pour coating to be applied? What sort of environment will the surface be applied in - external, subject to ambient temps or in a covered area like a building where you can control temps and humidity?
Approx dimensions for the coated area and approx fill depths would help also.