DAP DYNAFLEX ULTRA 7079818215 Advanced Exterior Sealant, Iron Gray, 40 to 100 deg F, 10.1 oz Cartridge

I'm replacing the south facing windows in my house and needed some caulk to seal them with. I had replaced the north facing windows years ago and used Alex Plus caulk, which while easy to apply and cleanup didn't hold up in the long run. It cracked and shrunk. Dynaflex Ultra goes on just as easy and is also easy to cleanup, but unlike silicone can be painted and also remains flexible after curing unlike the Alex Plus. I live in Colorado and this stuff has been applied to south facing windows so it's going to get tested to the extreme. We have temperature swings that can approach 100F on south facing surfaces all winter long, and extreme low humidity (1% was registered on my weather station twice) in the summer. If it holds up here it will work anywhere but only time will tell. That being said I'm impressed enough that I'm sitting here writing a review on caulk so that should tell you something! I'll try and return with an update after 6-12 months to see how it holds up this winter.