Sprayfoam
this sprayed foam, developed during the last decades of the Old Republic, could be applied to almost any flooring material to create a dense mat. It was often used in gymnasiums and makeshift fitness centers, and was popular among the troops of the Grand Army of the Republic for creating training facilities in the most remote parts of a planet. Anywhere there was a flat surface, sprayfoam could be applied to create a combat arena for hand-to-hand training.