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DERZTEK is a jointing compound which is used at COREX plasterboard joints over joint tapes. DERZTEK is easy to apply. Special additives in its structure retard the absorption of its moisture by the plasterboard surface. As well as functioning as a filler, DERZTEK also forms a smooth surface as a result of its special grain- size distribution. DERZTEK is highly adhesive. As it is a breathable material, by balancing the humidity DERZTEK creates a healthier environment. Because DERZTEK is so flexible, the plasterboard will not crack at the joints and will flex as one single surface. DERZTEK is a GREENGUARD certificated product that shows the effects of our products on indoor air quality.