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To keep your window screens in good working condition cleaning periodically with a stiff bristle brush will remove any debris that may cause the unit to stick of “freeze” in the track. A thin coat of paint can be applied to protect the metal surfaces. Once dry you can apply a thin coat of white grease sparingly to the unit before replacing it into the track. The same applies for wood storm and screen window frames when necessary to protect them from the weather. Aluminum frames can be cleaned with aluminum polish or steel wool and then coated with paste wax.
If a window frame begins to separate at the corners, you can mend and reinforce the corners with glue or with metal reinforcing angles, corrugated fasteners, wood screws, or glued-in wood dowels. First, lay the screen or storm window on a flat surface and clean out the gap in the joint. If it’s in good condition and the joint is clean, simply pour waterproof glue into the joint. Once you have it in the correct position, clamp it in place until the glue dries. If the frame is still loose, you can use metal reinforcing angles, corrugated fasteners or fasten with wood screws. Also you can reinforce the corners with glue coated dowels, clamp together opposite frame rails, using a long bar clamp and tap the dowel into a pre-drilled hole.
If the screen has a hole or tear, you need to patch it before it gets any bigger. If it is very large, or if the screening is old and worn, it's time to replace it. You can repair a very small tear in metal or fiberglass screening with epoxy or acetone type glue. Layer the glue on until the tear is filled. You can repair a small hole by weaving or darning strands of scrap screening into the tear. Weave the strands into sound fabric to close the hole. For bigger areas, cut a patch larger than the tear. Unravel each side, bend the end wires, and push then through. Bend the ends back to hold the patch.