Vinyl withstands assaults from moisture, heat, cold, humidity, salt, pollutants and acid rain; assaults that can and do affect wood and metal. Vinyl windows and patio doors never flake, blister, stick, rot, rust, peel or corrode. Vinyl’s color is integral throughout the material, so scratches go virtually unnoticed. You never have to paint, strip and sand or lubricate vinyl windows or patio doors. Vinyl is truly the most durable, lowest maintenance window and patio door material available.