So easy to use. No caulk gun needed. Adjustable Trigger Flow Nozzle. Advanced hybrid polymer formulation. Snap & Save cap eliminates waste. Seals out water, air, and moisture. Adheres to virtually any surface, wet or dry. Won’t shrink, crack, or become brittle. UV and chemical resistant. Fully paintable. Flex Caulk is our latest innovation in caulking technology. It’s a high-performance, hybrid polymer caulk, delivered through our adjustable trigger flow nozzle, which eliminates the need for a caulking gun and allows you to control the flow of caulk. Just adjust the flow setting and push the trigger for a perfect bead. And when you stop, it stops. There's no running, no dripping, and no mess.