WONDERFILL 1.13 kg Cost-effective, premixed, tongue & void filler. It requires no setup time & has no messy cleanup. After a lower impression is made, the tongue area is filled with Wonderfill, the plaster/stone is poured & sets, & then is removed for perfectly clean model. As a void filler, Wonderfill fills bubbles, air pockets, missing teeth, & undercuts resulting in better fitting appliances & bleaching trays.