Remove old, cracked caulk using a 5-in-1 tool or a stiff putty knife. Vacuum out dust and dirt. Wipe the area with rubbing alcohol—you need a pristine surface.
Pull the gun smoothly along the crack. Don't go back and forth. Aim to fill the void, not just cover the top. seal cracks around windows
The culprit isn't your furnace or your insulation—it’s the invisible gaps around your windows. Remove old, cracked caulk using a 5-in-1 tool
Snip the caulk tube nozzle at a 45-degree angle. You want a bead the size of a pencil lead, not a garden hose. Poke the inner seal with the wire on the gun. seal cracks around windows