Like all timbers, Macrocarpa will move when exposed to extreme weather / temperature conditions. Our standard coating Elastocure is designed to stretch and has a U.V. inhibiter to reduce the effects of the sun by reflecting the sun. If there is extreme temperature change then there is a small possibility that the coating may not be able to stretch enough and crack. Should this occur – as soon as practical - rub in some of the coating into the crack so that it is resealed to avoid water getting into the crack and enlarging it.