What is the best sealant to use on gutters?

A leaking gutter can quickly lead to serious water damage—but the right sealant can stop problems before they escalate. Gutter sealant is a must-have for quick repairs, joint sealing, and long-term durability. In this post, we’ll explore what gutter sealant is, how to use and remove it, and which product is best for protecting your home.

What Is gutter sealant?

Gutter sealant is a waterproof adhesive or caulk specifically designed to seal joints, cracks, and holes in gutter systems. It’s formulated to withstand outdoor conditions like heavy rain, UV exposure, and fluctuating temperatures. Available in silicone, polyurethane, and rubberized formulas, it helps extend the lifespan of your gutters and prevent leaks.

How to use gutter sealant?

To use gutter sealant effectively:

Identify the leak or area needing reinforcement.
Clean and dry the surface thoroughly.
Cut the sealant tube tip at a 45° angle for control.
Use a caulking gun to apply a steady bead of sealant along the seam or hole.
Smooth it with a putty knife if needed.
Let it dry completely before exposing it to rain.

How to remove gutter sealant?

Removing old or damaged sealant is essential for proper reapplication. Here’s how:

Step 1: Inspect the area

Locate old sealant that’s cracked, peeling, or ineffective.

Step 2: Soften the sealant

Use a heat gun or hairdryer on low to soften hardened sealant (if safe for the material).

Step 3: Scrape off the sealant

Use a plastic putty knife or scraper to gently remove the sealant without damaging the gutter.

Step 4: Use solvent (if needed)

Apply a small amount of mineral spirits or adhesive remover to clean stubborn residue.

Step 5: Wipe clean

Use a cloth to remove remaining product and prepare the surface for resealing.

Step 6: Let dry completely

Before reapplying new sealant, make sure the area is clean and dry.

How to apply gutter sealant?

Step 1: Prep the surface

Remove old sealant, dirt, or rust. Dry the area completely.

Step 2: Apply sealant

Run a bead of gutter sealant along the joint or crack using a caulking gun.

Step 3: Smooth and cure

Use a gloved finger or putty knife to smooth the sealant. Let it cure according to the manufacturer’s directions.

How long does gutter sealant take to dry?

Most gutter sealants dry to the touch in 1–2 hours, but full curing may take 24 to 48 hours, depending on the product and weather conditions. Always follow the product label for the best results.