Can You Spray Paint Fiberglass? (All You Need To Know)

There is no shortage of projects to complete around the house and many of those projects involve spray painting. Today, we’ll look at whether or not you can spray paint fiberglass and what important things you’ll need to consider during the process.

You can use spray paint on fiberglass, but because fiberglass often has a smooth, nonporous surface, you must take special care to choose the correct spray paint, sand, and abrade the surface of the fiberglass for better adhesion. Using a high-quality primer on the fiberglass before spraying the paint itself will result in a smoother finish.

In this article, we’ll discuss what you should know about spray painting on fiberglass surfaces, how to prep them for spray painting, and how to apply spray paint on fiberglass. We’ll also touch on some tips and tricks to make sure you get an even finish every time.

Can you spray paint fiberglass?

Fiberglass is used in everything from boat hulls to car bodies, but it’s most commonly seen as a material used in building construction because it has excellent strength-to-weight ratio.

Fiberglass is very durable, so it’s often used in outdoor applications such as decks, patios, fences, and other structures where it will be exposed to weathering and wear. Because of its durability, fiberglass is resistant to scratches and dents, making it ideal for many types of home projects.

Yes, you can spray paint fiberglass, and it’s actually pretty easy if you properly prep the surface before painting.

Fiberglass is made from extremely small fibers of glass that are bonded together by a resin. The resin is usually epoxy or polyester based, and the finished product often has a flat, smooth, glossy finish. Unfortunately, smooth finishes can be tricky for spray painting because it makes it easy for the paint to run, drip, or crackle after it dries.

Fortunately, prepping the fiberglass surface beforehand with a bit of light sanding and then applying a high-quality primer will almost eliminate those issues!

Also read: Can you spray paint Styrofoam?

How do you prep fiberglass for spray painting?

The first thing you want to do when preparing a fiberglass surface for spray painting is sand down any rough edges or imperfections. Sanding off these areas will help create a smooth surface for the spray paint to adhere to.

You don’t necessarily need to sand down the entire surface, but if you’re working on a large project, it’s probably best to just go ahead and remove any rough spots.

If you’re using a power sander, then follow the manufacturer’s instructions for proper operation. Some power sanders require that you preheat the surface before you begin sanding, while others allow you to simply turn the machine on and let it run until the job is done.

If you’re not using a power sander (or prefer hand sanding), you’ll need to take care when sanding. It’s important to keep the grit level low enough that you don’t scratch the surface too deeply. A good rule of thumb is to switch between fine, medium, and coarse grit sandpaper depending on the area being worked on.

For example, if sanding out a rust spot, you’d use fine-grit paper. On the other hand, if you were trying to sand away a seam line, then you would use a coarser grit.

Once you’ve removed any rough edges and smoothed out the surface, it’s time to prime the surface. Primer helps bond the spray paint to the surface, which makes it easier to cover up any imperfections later.

Using the same primer and spray paints that you plan to use on your project is recommended. Using different brands could cause problems during application.

Once you have primed the surface, it’s now ready to receive the spray paint.

How to spray paint fiberglass? 

Once you prepare the fiberglass surface well, then spray painting fiberglass is fairly straightforward. You just need to shake the can of spray paint thoroughly to avoid any bubbling or cracking issues. Then apply multiple thin coats of spray paint, letting each coat dry completely in between coats.

If you apply a single thick coat of spray paint on your fiberglass surface, we will most probably face dripping issues. So, to avoid these issues, multiple thin coats of spray paint are always recommended.

Keep the can of spray paint at least 6 to 8 inches away from the surface and move slowly while spraying. This will ensure even coverage and prevent overspray.

When applying the final coat of spray paint, make sure to wait about 30 minutes after the last coat has dried. Also, make sure that you have picked the right type of spray paint for your fiberglass surface.

Not all spray paints are suitable for fiberglass surfaces. So, it becomes very much important to pick the right type of spray paint.

Enamel semi-glossy spray paints are the best for fiberglass, and they can also be applied to various other surfaces like metal, wood, glass, etc.. These spray paints give a high gloss finish and are easy to apply. They are also available in a variety of colors.


Spray painting fiberglass is an excellent way to protect it against scratches, dents, and fading. But there are certain things that you must consider prior to starting this process. Make sure that you do some research first. Read through our article carefully so that you can get a clear picture of how to spray paint fiberglass.

Also, make sure that you follow the instructions mentioned above properly. Spray painting fiberglass is a fun DIY project for anyone who wants to add a new dimension to their home décor.

Hope you enjoyed reading our article. Do share your thoughts with us as well. We love hearing back from you guys!


Can you spray paint fiberglass?

Can I spray paint my fiberglass boat?

Yes, you can spray paint your fiberglass boat. However, you must know that not all types of spray paint are suitable for fiberglass.

Does spray paint stick to fiberglass?

Yes, spray paints usually stick to fiberglass pretty well, depending on the surface. However, you should prepare the surface of smooth and glossy fiberglass and then apply primer before spray painting to get the best results.

What kind of spray paint should I use on fiberglass?

You can use enamel semi-gloss or high gloss spray paints that suit your fiberglass needs.

Should I sand fiberglass before painting?

Yes, you should sand your fiberglass before painting. Sanding removes minor imperfections and makes the surface smooth.

How long does it take to spray paint fiberglass boats?

It depends upon the size of the boat and the amount of work required to clean up the surface. Generally speaking, it takes anywhere between 3 hours and 4 hours to spray paint a fiberglass boat.

Does Rust-Oleum work on fiberglass?

Yes, Rust-Oleum enamel spray paints work very well on fiberglass surfaces.

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