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Powertex fabric hardener is an environmentally friendly water based polymer. Hardens all natural materials such as cotton, paper, wool, cardboard. Can be mixed with Stone Art (Paper Mache) or Easy 3Dflex for air dry clay or to create texture in paintings. Powertex Transparent is NOT weather resistant and need to be varnished when you place your artwork outdoors. Powertex is also available in following colors, that are weather resistant : Bronze, Grey, Ivory, White, Black, Terracotta, Yellow Ochre, green, Blue and Red. Do not pour Powertex in the sink. FYI :Since Powertex is a liquid we can NOT accept returns.