Can i put polyurethane on laminate flooring to seal cracks?
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Does not sound like a good idea: https://www.doityourself.com/stry/can-i-apply-a-polyurethane-finish-on-my-laminate-floors
https://careertrend.com/way-5944074-coat-laminate-flooring-after-install.html
https://www.doityourself.com/stry/can-i-apply-a-polyurethane-finish-on-my-laminate-floors
no....not a recommended practice
Nope! Already has a finish stronger than polyurethane. Anyway, polyurethane doesn't seal "cracks". It a protective topcoat.