Epoxy for Outdoors? Why you should use Aliphatic Polyurethane (2018) 

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This presentation discusses the reasons why you should not apply epoxy outdoors, and instead use aliphatic polyurethane.
Epoxy will lead to yellowing and chalking.
Ktisopur UV is an aliphatic polyurethane coating suitable for protecting surfaces in outdoor areas. It's elastic properties make it an ideal solution for waterproofing and crack bridging.
Ktisopur UV is commonly used in pool decks, terraces, and rooftop car parks. The aliphatic PU coating is UV stable thus making it resistant to yellowing and chalking suitable for external use.
The product can also be used as a top protective coating on surfaces that have been waterproofed with Anydron 2K.
Because of its chemical composition, this aliphatic polyurethane coating is suitable for heavy foot traffic as well as vehicular traffic.