The company continued to expand, helped by the 1957 introduction of the airless spray gun. In order to distort the contours Keining used a spray gun and synthetic resins. Retroreflective glass beads are applied using a separate bead gun behind the epoxy spray gun. The material is sterile when it is dispensed from the spray gun or aerosol can. The first four 32 foot hulls were manufactured by a spray gun laminator. In this case, a texture paint is generally applied with a spray gun. In an air-atomized spray gun system, pressurized air is used to dispense the resin.