What is that stuff they cover the roof with on those eBay coops?

appps

Crowing
8 Years
Aug 29, 2012
4,784
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321
Australia
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I've cut one smaller but same materials as this up and used the nesting box part in my coop. I want to build a second matching nesting box but can't work out what that green stuff is they have used to waterproof it so I can buy some ?

Ideas?
 
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