Window sill paint fails not because of the paint quality alone, but due to substrate mismatch, inadequate preparation, or incorrect sheen selection. For 95% of residential applications, the optimal system is:
Modern water-based formulas are often superior for outdoors because they are flexible, allowing the paint to expand and contract with the window sill during temperature changes without cracking. Top Product Recommendations Which is the Best Paint for Window Sills - NoBroker paint for window sills