Twice as strong as regular body filler. Half-inch, interlocking fiberglass strands create strength and make Bondo(R) Glass the ideal filler for repairing small (dime size or smaller) holes or rust-outs. The fiberglass strands in the filler allow you to cover holes and eliminate the need for backing strips, fiberglass mat, or cloth. Make repairing small holes easy with Bondo(R) Glass.