What are Polyurethane Floors ? - An introduction 

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The Differences between Epoxy and Polyurethane floors:
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Polyurethane floors are usually softer and more elastic than epoxy. This makes them more resistant to scratching as their elasticity tends to absorb some of the impact. The elasticity of PU floors also makes them a preferred choice in freezing chambers where the storage temperature can reach -30 degrees Celsius (-22 F). They are also a good choice for multideck car-parks since the elastic coating can act as a waterproofing and crack-bridging layer.
Polyurethane floors can be easily modified to extend or limit their pot life, re-coat time as well as the total curing time. This flexibility enables contractors to complete PU floors in a much shorter space of time .With PU you could effectively start a multicoat project on Friday and hand it over on Monday. Epoxy floors are much less flexible in this respect in the sense that they usually require 7 days to fully cure.
In general polyurethanes are harder to work with. Their limited pot life and sensitivity to humidity require very well trained and experienced staff. Personally I refuse to supply inexperienced teams with PU floor resins. Too many things can go wrong.