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The Wedi 620 is a ready-to-use, single-component polymer sealant. It's a system component for Wedi building boards with a factory-applied vapour membrane barrier, as well as for the full line of Wedi sealing membranes. Wedi 620 is a water-resistant adhesive that interacts with humidity to produce an elastic adhesive. It's resistant to the elements and chemicals. The product is solvent-free, silicon-free, and PCP-free, with little shrinking.