<p>For glazing wood and metal sashes. Outlasts ordinary putty. Smooth and ready mixed. Excellent weather resistance. Knife grade.</p> <ul><li> Forms an airtight watertight seal</li><br /><br /><li> Resists sagging and cracking</li><br /><br /><li> Allows for expansion and contraction</li><br /><br /><li> Spreads smoothly and sands easily</li></ul>