Windows are focal points and require meticulous weather-tight preparation when painting exterior house frames and sashes.

Start by assessing each sash and frame for rot, loose glazing, and failing paint, and remove sashes when practical so you can refinish them off-site for a controlled finish and faster drying. Strip loose paint with a scraper and palm sander using progressively finer grit to feather edges, then clean residue with a mild detergent rinse and allow full drying before any primer. For glazing, press out deteriorated putty, sand edges smooth, and apply a compatible glazing compound to bed glass securely, tooling it flush and allowing manufacturer cure time; if muntins or small panes are present, consider re-glazing one sash at a time to maintain weathertightness. Choose a high-quality waterborne alkyd primer for bare wood or an exterior acrylic primer for previously painted surfaces to balance adhesion and flexibility, and follow with two coats of durable exterior topcoat applied in dry conditions and moderate temperatures. Address hardware by removing or protecting it during painting, lubricate moving parts, and replace compressed or torn weatherstripping to restore sealing performance after reinstallation. Finally, reinstall sashes carefully, check operation in multiple positions, and paint any exposed cut edges and rebate areas after fitting to preserve the protective barrier.

Common mistakes are failing to remove or properly prepare loose paint which leads to premature peeling, and the fix is to fully scrape and sand to sound material before priming. Another issue is glazing neglect where brittle putty allows water infiltration, so remove failed putty and apply fresh glazing compound with proper tooling and curing time. A third problem is choosing the wrong coating like rigid oil enamels that crack on seasonal movement, so select modern waterborne alkyds or flexible exterior acrylics and apply full recommended dry film thickness while maintaining ventilation and correct temperatures during cure.

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