What is the proper method for applying caulk flashing to ensure a watertight seal around windows and doors?

To apply caulk flashing for a watertight seal around Windows and doors, first clean the area thoroughly. Cut the caulk tube tip at a 45-degree angle and apply a continuous bead along the joint. Smooth the caulk with a wet finger or caulk tool. Make sure to fill any gaps completely for a secure seal.