How to Use a Sealant Gun

Updated February 21, 2017

According to Popular Mechanics, the sealant gun is one of the most misused building tools in the world. Improper handling of the sealant gun will be ineffective in sealing up indoor and outdoor cracks or spaces. Sealant, also referred to as caulk, is an adhesive chemical solvent or pigment. Using the sealant gun correctly will make it easier to waterproof and weatherproof your home.

Cut the nozzle of the sealant tube with a pair of sharp scissors or utility knife. Cut the nozzle according to the product's mark. If there is no visible marking, cut the nozzle at a 45-degree angle close to the package's opening.

Insert the sealant tube into the gun.

Practice applying an even bead of caulk on a sheet of newspaper. Squeeze the gun's trigger by adding a moderate amount of pressure. Don't add too much pressure as you can force the sealant to shoot out of the nozzle. Put the tip of the tube onto the newspaper, allowing it to drag along in a straight line. The pointy tip should drag across the surface of the newspaper.

Locate the area that needs sealing, placing the tube's nozzle directly on the area as you did in practice. Hold the sealant gun at 45-degree angle, using slow and even pressure to release the sealant from the gun. Once the sealant comes out of the gun, slowly move the gun along the surface.

Press the release mechanism on the back of the gun once you have reached the end of the area needed to be filled (the release mechanism will be a black or silver latch on the back of the trigger). This will stop the gun from oozing caulk when it is not in use.

Make sure that the sealant fills the entire area that needs caulking. Go back over areas that need more sealant by adding a little pressure on the trigger so that you will apply just enough added sealant.

Things You'll Need

  • Scissors or utility knife
  • Sealant
  • Sealant gun
  • Newspaper
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