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We had cement countertops installed a week ago. The contractor applied a thick layer of polyurethane (not sure the brand, but he mixed 2 parts of something) within a day or so, most of the poly was dry and smooth. There are spots that are still very tacky though. Is this normal? And how long do I need to wait for it to dry or cure, whatever the term may be?

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    It sounds like the parts were not mixed in accurate proportions, or were not mixed well, or perhaps it was old product. If there are still tacky spots after this many days, it is not likely to cure properly, and there isn't a good, reliable solution to curing what's there. Have the contractor sand it off and re-apply it. – fixer1234 May 5 '17 at 4:25
  • Can he just sand the spots and will the reapplication adhear to what is there already? – Linda Stitt May 5 '17 at 12:34
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    Unfortunately, that would be very visible. The only way to get it to look right is to do the whole surface. – fixer1234 May 5 '17 at 15:55
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    It might be possible to do it in place. It really needs to be assessed in person. The problem is that there isn't a good way to make the finish cure throughout at this point. It might be possible to treat the surface so that it isn't tacky, but it will be soft below the surface and won't hold up. – fixer1234 May 6 '17 at 1:12
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    Fixer make your comments an answer and I will up vote, fully agree with them. – Ed Beal Jan 10 at 0:31

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