ProVia developed its FineLine Technology to produce a straight, clean weld line on Endure Patio Door corners to achieve a “picture frame quality” look on the sashes. FineLine’s process is used to tuck the two ends of the corners together and create a neat, seamless look. FineLine Technology comes standard on all laminated Endure Patio Doors with the option to upgrade on white, beige and sandstone vinyl.