What caulking should you use for exterior of windows?

For the exterior of Windows, it's best to use a high-quality silicone or polyurethane caulk, as these materials provide Excellent weather resistance and flexibility. Silicone caulk is particularly effective for areas exposed to moisture, while polyurethane caulk offers superior adhesion and durability. Ensure the caulk is labeled for exterior use and compatible with the materials of your window frames. Always follow the manufacturer's instructions for application and curing times.