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Used to thicken polyurethane rubbers and plastics for making brushed molds and shells. Turns a pourable mold rubber such as Poly 74-30 into a brushable system with any level of thickening desired - thin for a face coat or thicker for subsequent coats. Also makes a pourable plastic into a highly versatile, brushable consistency for making lightweight mother molds or mold shells. Thickened plastics can be used to create thin, lightweight, laid-up castings. Add to polyurethane liquid rubbers to thicken for brush-on application or to liquid polyurethane plastics to thicken for making mold shells or layup castings. The level of thickening can be easily controlled to make thin gels to thicker pastes. Great for use with Poly 74-Series rubbers to make them brushable. Can also be used to thicken Polygel rubbers further. Works well with Poly 15-6 for making lightweight plastic molds shells that are durable and non-brittle.