Gunmetal by Marvin is now available in Elevate and Essential collections e1692887688892

Gunmetal by Marvin

Gunmetal Finish by Marvin is now available from JB Sash & Door, in Boston MA in our Elevate and Essential collections.

At JB Sash and Door, we are proud to be your local, independent Marvin dealer based in Boston, Massachusetts. We are excited to bring our customers contemporary and modern finish color options like Gunmetal Finish.

Gunmetal Finish by Marvin windows and doors


Perhaps you love the timelessness of traditional design. Maybe you’re into the minimal restraint of the Mid-Mod era. It could be that you’re obsessed with the character and quirkiness of a multicolored Victorian. No matter your style, Gunmetal by Marvin is an exclusive hue that transcends styles and fits perfectly into your world.


Gunmetal Finish: Designed to mix. Made to match.

Interior Gunmetal Finish windows

Why choose Elevate and Essential collection by Marvin?

The Marvin Elevate collection balances warm wood interiors with proprietary fiberglass exteriors.

The Marvin Essential collection is strong, durable, and virtually maintenance-free, designed with our proprietary fiberglass from the inside and out.

Benefits of fiberglass windows and doors

  • Endures harsh weather conditions and climates with minimal wear and tear over time
  • Virtually maintenance free
  • Provides exceptional structural strength, ensuring windows and doors open and close easily for years to come
  • It does not expand and contract with dramatic changes in temperature, making the product resistant to leaks, seal failures, and stress cracks
  • When combined with energy-efficient glass options, fiberglass keeps the indoors comfortable regardless of what’s happening outdoors

Why choose Marvin’s fiberglass windows and doors

Highest quality inputs

Choosing the right composite material is the key. For example, not all composites are created equal; for example, the fiberglass used in Marvin’s windows and doors is made with lineal fiberglass and thermoset plastics. This is what sets Marvin fiberglass apart from composites made with sawdust, vinyl, and other low-cost materials.

  • The high percentage of lineal fiberglass in Essential, Elevate, and Modern products contribute to the long-term performance. Because of the high concentration of glass, Marvin fiberglass expands and contracts very little, regardless of the changing temperatures. This stability means fiberglass windows and doors are less likely to experience seal failures, leaks, and stress cracks.


  • Ultrex fiberglass is 8x stronger than vinyl and 3x stronger than vinyl/wood composites. Marvin’s high-density fiberglass flexural strength equals the strength of aluminum
  • Fiberglass frames and sashes are less likely to bend and twist, helping protect the structural integrity of your home
  • Fiberglass is incredibly rigid, which makes it highly impact resistant and capable of standing up to everyday wear and tear, especially in extreme weather conditions
  • Because of their strength, fiberglass frames and sash are typically narrower than other types of frames but can still meet the structural performance requirements. More streamlined frames and sashes create an uncluttered aesthetic with less frame, more glass, and bigger views.

Superior Process

Ultrex and Marvin high-density fiberglass are created through a process called pultrusion. Unlike extrusion, where material is pushed through a die, pultrusion pulls material through. The pulling versus pushing action makes it possible for long, lineal glass fibers to become embedded and highly concentrated in the fiberglass as it is pulled through a die. This high concentration of glass fibers results in superior strength. It also contributes to the exceptionally smooth and durable finish.

Gunmetal Finish: A Finish That Lasts

Marvin fiberglass offers a premium, smooth finish – unlike rough textured finishes on some competitive composite products.

  • Ultrex features an acrylic finish that is bonded to the fiberglass through a proprietary process. The Ultrex finish protects against fading, chalking, and gloss retention. The finish is AAMA 624 verified, which means it has undergone rigorous tests that simulate the difficult conditions a finish can encounter throughout the life of a window or door
  • The Marvin high-density fiberglass finish is baked on at extremely high temperatures resulting in a finish that exceeds a high-quality aluminum car paint. The high-density fiberglass finish is currently undergoing the AAMA 625 verification process


How Much Does Fiberglass Windows Cost?

There are many factors affecting the cost of fiberglass windows and doors. For example, the size of the windows directly affects the final price. Consider that fiberglass windows and doors last, on average, 38 percent longer than vinyl windows*. When considering Marvin products, it is important to note that there is no “good, better, best” model for window options and cost structure. All Marvin windows are manufactured with rigorous standards, including fiberglass windows. Contact your local Marvin dealer to obtain an estimate on fiberglass windows for your next project.