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If the product does the job it will seal and the residual water will burn off. Before starting it be sure there isn't a lot of standing water in the suspect cylinder that would cause hydraulic lock. Look down the spark plug hole if you can or insert a wooden dowel and use it like a "dipstick". The engine will have to come up to temp and circulate the coolant to effectively seal the leak.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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