Seal Seams and Fasteners in a fraction of the time with the Roof Tube Classic. It Holds a 1/2 gallon of your favorite water proofing mastics... And YES! in most cases the roof tube can draw up most thick heavy mastics. When used in conjunction with job specific tips (sold separately) you can find the perfect combination to get your roof restorations projects completed in faster time with less stress on your crews. Check it out below !! Cleaning the tube is simple by flushing and re-lubricating the tube keeping in mind the appropriate Cleaners and solvents.