What Happens If You Don’t Paint a Fiberglass Door? [Expert Answer]

Randy Charles
Professional Painter

Randy Charles is the owner of PaintCentric.com, a website dedicated to providing information, tips, tricks, and news about all things paint. With over 10 years...Read more

When you overlook painting a fiberglass door, various issues arise. This text guides you on what happens and how to tackle it.

If you neglect to paint a fiberglass door, it won’t be just a matter of lacking color. Fiberglass doors need paint for protection. Without it, the door faces rapid wear. Ultraviolet (UV) rays from the sun are harmful. They make the door’s surface dull and cause it to weaken over time. This leads to cracks and warping, which ruin the door’s look and function. Weather plays a role too. Rain, snow, and humidity affect an unpainted fiberglass door. The door may not absorb water like wood, but it still suffers. It can stain, discolor, and develop a rough texture.

The unpainted door also lacks energy efficiency. Paint adds a layer that helps with insulation. It keeps heat in during winter and out during summer. Without this layer, your energy bills might go up. Aesthetics matter as well. A door without paint looks unfinished. It affects the curb appeal of your home. It can even influence your home’s value negatively.

What are Fiberglass Doors?

Fiberglass doors are a popular choice for homeowners looking for a durable and versatile option. Made from a composite material, fiberglass doors combine fine glass fibers with resin to form a robust and long-lasting product. These doors resist wear from daily use and harsh weather conditions better than traditional wooden doors. They do not warp, rot, or rust, making them ideal for homes in areas with severe weather changes. The versatility of fiberglass allows for a variety of designs, from smooth finishes that mimic a modern, painted look to textured varieties that look indistinguishable from real wood.

Do Fiberglass Doors Require Painting?

What Happens If You Don’t Paint A Fiberglass Door

Yes, fiberglass doors require painting for several crucial reasons. Firstly, the layer of paint serves as a shield, protecting the door from the elements. Even though fiberglass is inherently resistant to rot, rust, and warping, the surface can still be damaged by prolonged exposure to sunlight and moisture. Paint blocks harmful UV rays that can cause fading and degradation of the door surface. Over time, a door without paint can develop a chalky texture and lose its vibrant color, leading to a less appealing appearance and potential material breakdown.

The paint adds an extra layer of insulation, helping to maintain temperature control inside your home. This layer keeps heat from escaping in the winter and prevents it from entering during the summer, which can reduce heating and cooling costs.

What Happens If You Don’t Paint a Fiberglass Door

If you have a fiberglass door, you might wonder if you need to paint it. Fiberglass doors are known for being strong and long-lasting. But even if they don’t need paint to be strong, not painting your fiberglass door can lead to some issues. Over time, the sun and weather can make the door look old and worn. Here’s what can happen if you decide not to paint your fiberglass door.

Fading and Discoloration

Without paint, the vibrant color of your fiberglass door will fade. Sunlight has UV rays that can be very harsh. Over months and years, these rays can break down the door’s surface, causing the color to turn dull and uneven. Think about when fabric gets bleached by the sun; a similar thing happens to your door. If your door was once a bright or dark color, it might turn to a lighter, less vibrant shade. This can make your home look less inviting.

Surface Damage

Paint also protects the surface of your door from small scratches and nicks. If your door bangs against something or if something sharp touches it, paint can act like a shield. Without this layer of paint, the door’s surface can get more damage easily. Over time, these small damages can add up, and your door might not look as smooth and neat as it once did.

Warping and Cracking

Fiberglass is resistant to warping and cracking, but without paint, the risk increases. Paint adds an extra layer that helps keep moisture and heat from changing the shape of the door. In extreme weather, like very hot or cold days, your door expands and shrinks. Over many seasons, this can lead to warping, which is when the door bends or twists, and cracking, which can make the door weak at some points.

Maintenance Costs

In the long run, not painting your fiberglass door can mean more work and money for you. Paint helps make cleaning easier since dirt can wash off paint more easily than the bare door surface. If the door starts to look old or damaged, you might have to spend money on repairs or even replacing the door sooner than you would have if it had been painted. A good coat of paint now can save you time and money later.

Will my fiberglass door last without paint?

Your fiberglass door can last a long time even if you don’t paint it because it’s made from durable material. However, painting it will protect it from the sun’s rays, which can cause the color to fade and the material to weaken over time.

Can sunlight really damage an unpainted fiberglass door?

Yes, continuous exposure to sunlight can cause damage to an unpainted fiberglass door. The UV rays from the sun can lead to fading and discoloration, and over time, the door may show signs of wear like warping or cracking.

What are the signs of weather damage to an unpainted fiberglass door?

Signs of weather damage include changes in color, with the door looking washed out or having an uneven shade. Other signs are warping, where the door does not sit straight, and cracking, where you may see lines or splits in the door’s surface.

Is it more expensive to maintain an unpainted fiberglass door?

Not painting your fiberglass door can lead to higher maintenance costs down the line. While paint adds a protective layer that makes cleaning easier and protects against scratches and weather damage, an unpainted door will require more frequent touch-ups and could even need to be replaced sooner if the damage is severe.


Painting the sides of your fiberglass door that show the wood is important to make your door last longer and stay safe from weather. This article gives you easy steps to paint your door and keep it looking new for a long time.

Key Takeaways:

  • The sides of your door made of wood can get damaged by water and swell up.
  • If you don’t cover the wood sides of your fiberglass door with paint, bad things like rotting, the wood getting fat with water, layers of the door coming apart, and the door not lasting as long can happen.
  • To paint these wood parts of your fiberglass door, first get the door ready, put on a base layer called primer, and then paint two light layers.
  • If you’re not sure how to paint your door or have other questions, it’s a good idea to talk to someone who knows a lot about painting doors.
Randy CharlesProfessional Painter

Randy Charles is the owner of PaintCentric.com, a website dedicated to providing information, tips, tricks, and news about all things paint. With over 10 years of experience in the painting industry, Randy has become an expert in the field and is passionate about helping others learn more about painting. He has written numerous articles on the subject and is committed to providing accurate and up-to-date information to his readers.

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