iDye Poly makes the often very challenging task of dyeing synthetic fabrics a breeze. There are a few dyes on the market that claim to dye polyester, however, the results are usually less than impressive. No so with iDye Poly. Get great results on polyester and many other materials including plastics and nylons, buttons, thermoplastics, 3D printed objects, wigs, urethane coatings and more. The dye comes in a dissolvable packet, so there are never any messy powders to handle: simply drop the packet in a pot of water, add the fabric or objects and bring to a simmer.