Step-By-Step Guide On How to Repair RV Fiberglass Exterior Damage

October 4, 2024

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Owning an RV is all about freedom, adventure, and the open road. But as any seasoned traveler knows, the road can be a bit unforgiving. Rocks fly up, weather takes its toll, and before you know it, your RV’s once-pristine fiberglass exterior has a few battle scars. Fortunately, you don’t need to be an expert to fix these issues. With the right tools and guidance, you can repair your RV’s fiberglass exterior and get back on the road.

So, how do you repair RV fiberglass exterior damage? First, assess the damage, clean the surface, sand it, apply a fiberglass patch with resin, and finish with sanding and paint. With the right materials, you can fix damages and save on costly repairs.

However, if the damage is extensive or you’re not confident in your DIY skills, professional help is always an option. This guide will take you through all the steps, plus explain when it might be time to call in the pros for a flawless finish.

Keeping Your RV in Great Shape

RVs go through a lot during their time on the road. Dings, scratches, and cracks are just part of the journey. But ignoring those small damages can lead to bigger, more costly problems down the line. That’s why it’s essential to jump in and fix any fiberglass damage as soon as you spot it. You don’t want water seeping in or cracks spreading, right?

Why Fiberglass is the Top Choice for RVs

Fiberglass is durable, lightweight, and gives your RV a sleek, modern look. Plus, it’s relatively easy to repair when something goes wrong, which is great news for DIY enthusiasts like you! By understanding a bit more about fiberglass, you’ll know exactly how to maintain it and handle any repairs that come your way.

Identifying the Damage to Your RV


Before you get too far into the repair process, take a closer look. Sometimes, what appears to be a minor crack or scratch could be hiding a bigger issue underneath, like water damage or mold. Look for any signs of moisture or discoloration around the damaged area during your RV maintenance routine. It’s better to catch these problems now than have to deal with them later!

White RV parked on the roadside, illustrating a vehicle that may require knowledge on how to repair RV fiberglass exterior damage.

Recognizing the Types of Damage

  • Scratches and Scuffs: These are the small, surface-level marks that don’t go too deep. They’re easy to fix with minimal effort.
  • Cracks and Holes: This is more serious damage, where the fiberglass itself is compromised. Cracks can get worse if left untreated, so these should be handled quickly.
  • Cosmetic vs. Structural Issues: Cosmetic damage might be annoying, but it doesn’t affect the RV’s performance. Structural damage, on the other hand, can lead to leaks or other problems if not addressed.

Checking for Hidden Problems

Before you get too far into the repair process, take a closer look. Sometimes, what appears to be a minor crack or scratch could be hiding a bigger issue underneath, like water damage or mold.

RV parked at a campsite with awning extended.

Look for any signs of moisture or discoloration around the damaged area. It’s better to catch these problems now than have to deal with them later!

Gathering Your Tools and Materials

Now that you’ve assessed the damage, it’s time to gather your supplies. Having the right tools will make the repair process smooth and stress-free.

The Tools You’ll Need for the Job

You won’t need a huge toolbox for this, but there are a few essentials you should have on hand:

  • Sandpaper (varying grits)
  • Fiberglass patch kit
  • Resin (included in most patch kits)
  • Mixing container
  • Spreader
  • Safety gear (gloves, goggles, and a mask)

Choosing the Best Materials for Fiberglass Repair

Here are a few trusted brands to consider when shopping for your repair materials:

  1. Bondo Fiberglass Resin Repair Kit: Bondo is a well-known brand with a reliable Fiberglass Resin Repair Kit. It includes everything you need: resin, hardener, fiberglass cloth, and mixing tools. Perfect for smaller repairs or patches.
  2. Evercoat Fiberglass Resin: Evercoat offers high-quality Fiberglass Resin, which is easy to work with and great for repairing cracks and holes. You can purchase their resin separately or as part of a complete kit.
  3. TotalBoat Polyester Resin: For those bigger, heavy-duty repairs, TotalBoat Polyester Resin is a top choice. It’s known for its durability and ease of use, perfect for ensuring long-lasting fixes.

Preparing the Surface for Repair

Preparation is everything! Before you start slapping on resin, you’ll need to properly clean and prep the surface.

lot for ac camper repair in Tampa

Cleaning and Prepping the Damaged Area

Start by thoroughly cleaning the damaged area. You want to remove any dirt, grease, or loose fiberglass particles. A clean surface will allow the patch to stick properly. Don’t forget to dry the area completely before moving on to the next step.

Sanding the Surface for a Perfect Patch

Once the area is clean, it’s time to sand down the damaged area. Use medium-grit sandpaper to smooth the surface, and if you’re dealing with a crack or hole, round off the edges. This will make it easier for the patch to blend seamlessly with the surrounding area.

Step-by-Step Guide to Repairing Fiberglass

Now for the fun part—the actual repair! Follow these steps, and you’ll have your RV looking great in no time.

Large RV parked in a scenic outdoor setting, highlighting the importance of maintaining the exterior

Applying the Fiberglass Patch

  1. Cut the patch: Using scissors, cut your fiberglass cloth to fit the damaged area. Make sure it’s slightly larger than the crack or hole.
  2. Mix the resin: Follow the instructions on your patch kit to mix the resin and hardener. Brands like Bondo or 3M are perfect for this step.
  3. Apply the patch: Place the fiberglass cloth over the damaged area, then use a spreader to coat it with the mixed resin. Smooth out any bubbles or wrinkles.
  4. Layer if necessary: For larger holes, you might need to apply more than one layer of fiberglass cloth and resin.

Letting the Patch Cure Properly

Once the patch is in place, you’ll need to let it cure. The curing time will depend on the temperature and humidity where you’re working, so be sure to follow the manufacturer’s instructions. Most repairs will need a few hours to fully set, but don’t rush it—proper curing is crucial for a strong repair.

Finishing Touches to Make Your RV Shine

The patch is in place, but you’re not done yet! To get your RV looking its best, you’ll need to sand, buff, and possibly paint the repaired area.

Sanding and Buffing the Repaired Area

After the patch has cured, sand the area again using fine-grit sandpaper to smooth out any rough spots. Buff the surface to blend the patch with the surrounding fiberglass. Take your time with this step—it’s what makes the repair invisible!

Painting and Sealing the Repair for a Professional Look

To really finish things off, apply paint that matches your RV’s exterior. Then, add a layer of sealant to protect the repair from future damage. Not only will this make the patch look flawless, but it’ll also keep your RV’s exterior tough and ready for the road.

When to Call in the Pros

While DIY fiberglass repairs can save you money and be a rewarding project, sometimes the damage is too extensive, or you may simply prefer the flawless finish a professional can provide. Large cracks, significant water damage, or repairs that cover a big portion of your RV’s exterior are best left to the pros. A professional technician will have the experience, tools, and materials to make your RV look brand new again, without the risk of further damage or complications.

White motorhome parked on the roadside

For RV owners in Florida, Tampa Mobile RV Repair is a top option for expert fiberglass repair. They specialize in RV repairs and can handle even the most complex fiberglass damage. Whether it’s a small crack or a large section of your RV that needs restoring, their skilled team will ensure the job is done right, allowing you to get back on the road with confidence.

Tips for Preventing Future Fiberglass Damage

Now that your RV is all fixed up, let’s talk about keeping it that way. Here are a few tips to prevent future damage:

  • Use RV covers when your vehicle is in storage to protect it from the elements.
  • Avoid close parking next to trees or other obstacles that could scrape your RV.
  • Regularly inspect your RV’s exterior for any signs of wear and tear. The sooner you catch damage, the easier it is to fix!

Hit the Road with Confidence!

And that’s it! You’ve just learned how to repair RV fiberglass exterior damage like a pro. With a little time and effort, you can keep your RV looking great and ready for the next adventure. So go ahead—hit the road with confidence, knowing that you’ve got the skills to handle any bumps or dings that come your way. If you ever need expert help, call Tampa Mobile RV Repair, and we're always ready to assist. Safe travels!

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