The 3M Scotchcast Plus Casting Tape consists of a knitted fibreglass fabric impregnated with polyurethane resin and is light in weight. The tape becomes rigid as it has the exposure to moisture or water that initiates a chemical reaction. Finished casts produced from Scotchcast Plus casting tape are strong, radiolucent, and porous. The tape contains a lubricating agent in the resin to provide a slippery feel when exposed to water. The water-activated resin lets you control working time according to application needs.