a method of sealing pipes or ducts with a duct coating applicator having a camera mounted thereon . the duct coating applicator sprays plural compounds on an interior of the duct . a duct coating applicator mounted camera records a video of an inside of the duct . the video is quickly accessible for customer review on site . a customer billing statement is quickly generated on site . a controller communicates with the nozzle carriage . a pump feeds the duct coating applicator from a resin tank via a resin supply line . the controller receives resin temperature and pressure , duct diameter , and duct coating applicator speed data and can adjust resin feed and duct coating applicator speed rates . the duct coating applicator has a cylindrical body having an outer member and a core member . an adjustable nozzle is on an outlet end for dispersing resin . extension arms may be adjusted to accommodate various duct sizes .