Why Aluminum Window Frame Repair Fails When Filler Pops Out
The Failure Happens at the Bond Line A screw hole in an aluminum window frame looks like a simple cosmetic problem, but the repair usually fails for a much more specific reason: the filler never truly bonded to the metal, or it bonded to a surface that keeps moving under heat. A practical screw hole repair can look flawless on day one and still pop loose after a hot season if the surface chemistry and thermal movement were ignored. ...