WORKS WELL WITH CAULKS, SEALANTS, AND YOU. TYPAR Butyl Flashing definitely delivers on the basics. It's designed to peel quickly, stick fast, and keep projects on budget. But going beyond the fundamentals, it's formulated without voes, and it's compatible with most caulks and sealants used for window installation. Compared to rubberized asphalt-based flashings, TYPAR Butyl Flashing simply brings more to the job. It's pliable in cold weather. It's stable at high temperatures. Plus it maintains a flexible, but tight seal for far greater durability and long-lasting performance.