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Waterproof sealant: Tips for proper application

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Keep water and moisture damage at bay with the best waterproof sealant as your weapon. Read on to find out more about proper application.

Waterproof sealant: What to look for

To preserve the value of your home, keeping it safe from moisture is key. Damage from leaks and flooding is always present, but with the right waterproof sealant you can prevent water from entering your house in the first place. Apply the best waterproof caulk or sealant to the following areas:

  • windows
  • doors 
  • pipes and gutters
  • vents
  • roof flashings
  • lacks and holes


Tip: For a quick and budget-friendly approach, apply waterproof sealer to typical points of entry such as doors, windows, and the roof.

Steps to applying waterproof silicone sealant

The best product for keeping water out is a waterproof silicone sealant. The silicone improves the quality of your sealant by upping both the flexibility and adhesion.

A person applies caulk with a caulking gun at the edge of a bathtub.
Remove the old caulk before applying the new one, and then you can apply the caulk precisely with a caulking gun

There are a few steps to follow in order to properly apply waterproof silicone caulks and sealants: 

  1. Remove any old caulk from the area with a putty knife or a sharp tool. For extra stubborn caulk, apply a removal gel.
  2. Clean the area of any residue. If you’ve used a removal gel, use a household cleaner or alcohol to get rid of the excess. 
  3. Make sure you have a good-quality caulking gun for optimal application.
  4. If the gap you have is too big for the sealant to fill (about ½ inch or bigger), place a backing rod in the area first, followed by the sealer. 
  5. To finish up neatly, run a finishing tool along the bead.


If you keep up on home maintenance, performing a quick check around your house will allow you to fix any jobs that might have come up throughout the year. For a fast, efficient touch-up to your outdoor fixtures, pick up a bottle of Loctite Stik’N’Seal Outdoor Adhesive. Its tight waterproof bond makes it ideal for plumbing repairs, for instance.

A hand cuts off the tip of a sealing cartridge.
If you want to improve your bathroom, first cut off the tip of the sealing cartridge

For the big jobs, primarily outdoors, reach for Loctite 100% Silicone sealant. This premium sealant withstands temperature of -65°F to 300°F, making it a great choice for sealing heating and cooling components. It is also highly resistant to ultraviolet light and other environmental elements, making it the ideal choice for exterior applications. It forms a weatherproof bond to materials like glass, ceramics, aluminum, primed steel, and some plastics

If you need to work on a bathroom project, there is Loctite Polyseamseal Tub & Tile Adhesive Caulk. Its special Seal & Bond technology gives you a watertight and long-lasting seal which is also mold and mildew resistant. You can choose between two sizes, depending on the scope of your project.

Products used

  • loctite polyseamseal 100 percent silicone sealant white 10oz cartridge
    Loctite Polyseamseal 100% Silicone

    Watertight interior and exterior seal.

  • loctite polyseamseal tub tile white 10oz cartridge
    Loctite Polyseamseal Tub & Tile

    Provides a durable bond and seal for kitchen & bath projects.

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