Ardex WPM200 is a epoxy coating used to achieve waterproofness in either external areas or in special situations in a swimming pool build. It is a 2 coat system and comes packaged in 2 colours, grey and black. Usually the first coat is applied in black, once dry, the second coat is applied in grey, over the black which highlights that all parts have been coated twice. Essentially there is no difference apart from colour between the two.
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