Marcy Quantum Molding 7mm × 75ft | 1/4" Universal Exterior Replacement | QM7
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The Marcy QM7 is a 7mm flexible universal exterior replacement molding, sold as a 75ft roll. Designed for narrow glass openings where a lightweight, flexible profile is needed, it installs cleanly around the glass perimeter and provides a finished, weather-resistant edge. Use it wherever OEM exterior molding is damaged, missing, or unavailable as a replacement part.
Specifications
- Part Number: QM7
- Width: 7mm (approx. 1/4")
- Length: 75ft (22.8m) roll
- Style: Standard
- Application: Universal exterior replacement molding
Width Selection Guide
Measure the gap between the glass edge and the surrounding trim or channel. At 7mm, QM7 is the narrowest option in the Quantum line — suited for compact vehicles, small quarter glass, or specialty applications with tight exterior channels. If your gap measures closer to 3/8", consider stepping up to the QM10.
What is Quantum Molding?
Quantum Molding is a flexible exterior universal replacement molding designed to fit a wide range of glass openings without requiring a vehicle-specific part. It installs along the exterior glass edge and provides a clean, weather-resistant finish. It's commonly used when OEM molding is damaged, missing, or no longer available as a direct replacement.
What's the difference between standard and Design Line?
Standard Quantum Molding has a uniform profile across the full width. Design Line (QM16L and QM19L) features a decorative accent integrated into the outer face of the molding, giving it a more finished, OEM-like appearance from the exterior. Design Line is the right choice when the molding will be visible and aesthetics matter.
How do I select the right width?
Measure the gap between the glass edge and the surrounding trim or pinchweld. The molding width should match this gap closely. Quantum Molding is flexible enough to accommodate minor variation — but if you're between sizes, the narrower width typically seats more cleanly than one that's too wide.
How is this installed?
Press the molding into place along the glass edge, typically after the glass has been set. Work around the perimeter section by section, pressing firmly into the channel. For tight curves, a brief pass with a heat gun on low makes the molding more pliable. A molding tool or wide flathead helps seat it evenly without scuffing the surrounding trim.
How much molding does one job use?
A standard windshield perimeter uses approximately 12 to 16 feet of exterior molding. A 75ft roll covers roughly 4 to 6 full installs. For smaller glass like quarter windows or rear sliders, a roll goes significantly further.