Amazon.com: Second Skin Butyl Sealant Tape – Butyl Rubber Sealant, Multi-Purpose Butyl Rope, and Putty Tape for Automotive (Car, RV, Marine) – 1/4” x 1/2" x 20' – Made in The USA :
Trex RainEscape Butyl Caulk 10.1-oz Gray Synthetic Rubber Self Leveling Caulk in the Caulk department at Lowes.com
DAP 10.1 oz Cartridge Clear Butyl Rubber Caulk -30 to 200°F Operating Temp, 10 min Tack Free Dry Time 7079818388 - 02572576 - Penn Tool Co., Inc
11.5ft 3.5M 8mm 0.31 Inch Butyl Rubber Sealant Sound Deadening Rope Caulk Tape for Car RV Windshield Headlight Door - Walmart.com
DAP Butyl-Flex 10.1 oz. White Gutter and Flashing Sealant (12-Pack) 7079818182 - The Home Depot
SB-140 High-Performance Butyl Rubber Sealant WHITE, 10.3 oz (case/12)
White Lightning Butyl Rubber Caulk: Radon Supplies