Because you have to apply joint compound and then the tape, taping drywall can be a time-consuming and messy job. Quick-load drywall tapers, which are also called taping banjos, save time by combining taping and applying mud to drywall seams into one step. Most homeowners can easily operate a quick-load drywall taper. The tricky part is in mixing the mud to the right consistency and loading the gun.
Transfer about 1 gallon of drywall joint compound (all-purpose premixed compound is the easiest type to work with) to a 5-gallon pail. Mix enough water to the compound to make it pourable using a mud mixer or a mud masher, which is a drywall tool with a long pole and an end that resembles a potato masher. Add about 1 cup of water per gallon until the mud is similar to heavy texture paint in consistency -- or until the mud drips in large blobs from the mixing tool.
Load a roll of 250- or 500-foot paper drywall tape that is no wider than 2 1/8 inches onto the top of the tape gun.
Open the mud chamber door and feed the tape through the chamber, running it under the first tape guide and then over top of the second. Next, pull it out the opposite end of the chamber.
Push the tape to the top of the machine so it doesn’t touch the chamber wall, and pour mud into the chamber until it reaches the full line.
Pull the end of tape. The bottom side should have an even coating of mud, about 1/8 inch thick. If the mud in the chamber is too thick, it may not coat the tape.
Turn the adjustment screw, which is typically above the end where the tape comes out, to adjust the chamber opening if there is too much or too little mud. Close the mud chamber door and fasten the latches.
Place the end of the tape against the wall at the top of your drywall seam. Press it in place with a 6- or 8-inch taping knife, and pull the taper down and slightly away from the wall. As the tape is pulled from the chamber, press it against the seam with your knife.
Cut the tape with a quick, downward motion or rip it by hand when you reach the end of the seam.
Press and smooth the tape with your drywall knife to flatten it over the seam. Scrape off excess mud as it’s pressed out from behind the tape.