If you place a slightly thicker layer of High-build (not the super-fast one) Polyurethane on the floor, what will happen that the top layer will dry faster because of direct exposure to air, therefore, forming an air-tight protective layer over the bottom Polyurethane fluid. It's just like as if you put water in a Ziplock (air-tight) bag and wait for it get dry. Although the container reads that High-build/Regular Polyurethane dries in 24 hours which is actually the time it takes for the top layer to dry. The day you encounter the Ziplock Effect of Polyurethane, remember that it will now take 3 to 6 weeks for the Polyurethane to properly harden in order to avoid wrinkles by pressure slide, heavy traffic/utilization or furniture move.
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