With the prepwork done, it was time to get down to laying some new 'glass. Johns Customz uses marine-quality fiberglass mat for greater durability against the elements. The fiberglass resin and its hardener should be mixed according to the manufacturer's specs. Mar-Glass is a body filler that contains strands of fiberglass--it actually bonds with fiberglass mat. The bottle in the middle contains a body glaze, a light filler that will be used to smooth out the repair areas.