In the past my favorite sealant has been GE paintable silicone, sometimes referred to as XST. Recently I've started noticing yellowing and other issues that I hadn't noticed before. With my recent purchases I decided to try something new. Studies have shown it to be the best sealant in the same range as XST. In terms of performance, it doesn't disappoint. That thing sticks to everything! The only downside is that it's a bit messy when working with tools. If you're looking for a more comfortable, high-performance seal, I recommend Big Stretch. Other than that, this sealer is the best sealer I've ever used.