Next Sunday, take a putty knife and walk around your house. Poke the cracks. If the putty crumbles, thank it for its decades of service—then show it the door.
Allow the putty to "skin over" (form a dry surface) according to the manufacturer’s instructions—usually 7 to 14 days. Once dry, paint the putty to match the window frame. The paint must lap onto the glass by 1/16th of an inch to ensure a complete seal. cracked window putty
Over time (usually 20–30 years), oil-based putty loses its plasticizers. The sun bakes it. Freezing nights shatter its remaining elasticity. The result is predictable: cracks. Next Sunday, take a putty knife and walk around your house