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dad911 is right about a concrete overlay not bonding if the original was sealed. If that's true, a skim coat shouldn't bond either. If you put anything on top like slate, tile, or ?? that requires an undercoating to bond it won't work. The only possible thing I can think of is to get somebody in there with a grinder to grind the top eighth of an inch or so off. Then something else could be done over it.
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Marv Evans
'69 911E
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