Repairing and Resealing RV Corner Moldings

The Dreaded Corner Molding Dilemma

As an RV enthusiast, I’ve encountered my fair share of pesky issues with corner moldings. These seemingly innocuous little strips of trim can quickly turn into a real headache if left unattended. In fact, I can still remember the time I was out on a cross-country road trip when one of the moldings on my RV started to peel off. Let me tell you, it was not a pretty sight. The flapping corner molding was an eyesore, and I was constantly worried it would catch the wind and rip completely off, leaving me with an unsightly gap on the exterior of my beloved RV.

That experience taught me a valuable lesson: addressing RV corner molding issues head-on is crucial to maintaining the structural integrity and aesthetic appeal of your vehicle. And trust me, I’ve learned a thing or two over the years about how to properly repair and reseal those tricky little corners. In this in-depth guide, I’m going to share all my hard-earned wisdom so you can tackle this common RV maintenance task like a pro.

Understanding the Anatomy of RV Corner Moldings

Before we dive into the nitty-gritty of repairing and resealing, it’s important to have a solid understanding of what RV corner moldings are and how they’re constructed. These flexible strips of trim are typically made from vinyl or aluminum and are designed to cover the joints where the sidewalls of the RV meet the roof and floor.

The primary purpose of corner moldings is to create a smooth, seamless transition between these surfaces and to prevent water and debris from infiltrating the RV’s interior. They also play a crucial role in protecting the structural integrity of the vehicle by reinforcing those vulnerable corner joints.

Now, I know what you’re thinking: “If they’re so important, why do they always seem to give me trouble?” Well, the truth is, RV corner moldings are exposed to a lot of wear and tear on the road. The constant exposure to the elements, combined with the flexing and twisting of the RV’s frame, can cause these moldings to become loose, crack, or even fall off entirely over time.

Identifying Common RV Corner Molding Issues

One of the first steps in effectively repairing and resealing your RV’s corner moldings is being able to recognize the various issues that can arise. Here are some of the most common problems you might encounter:

Peeling or Lifting Moldings: As I mentioned earlier, this was the problem I faced on my cross-country trip. When the adhesive that secures the molding to the RV starts to fail, the molding can begin to peel away from the surface, creating an unsightly gap.

Cracked or Damaged Moldings: Over time, the constant exposure to the sun’s UV rays and the elements can cause the molding material to become brittle and crack. This not only looks unsightly but also compromises the molding’s ability to effectively seal the corner joint.

Gaps or Holes: In some cases, the molding may have already fallen off or been damaged to the point where there are gaps or holes in the corner joint. This can allow water, dirt, and other debris to infiltrate the RV’s interior, potentially leading to even more serious issues.

Discoloration or Fading: Even if the molding itself is still intact, the constant exposure to the sun can cause the material to become discolored or fade over time, detracting from the overall appearance of your RV.

Recognizing these common issues is the first step in determining the best course of action for repairing and resealing your RV’s corner moldings. And trust me, addressing these problems sooner rather than later can save you a lot of headaches (and money) down the road.

Preparing the Surface for Repair and Reseal

Now that we’ve covered the basics of RV corner moldings and the potential issues you might encounter, let’s dive into the nitty-gritty of the repair and reseal process. The first and most crucial step is properly preparing the surface for the repair.

Before you can even think about applying a new sealant or adhesive, you’ll need to thoroughly clean the area around the corner molding. This means using a cleaner specifically formulated for RV surfaces to remove any dirt, grime, or residue that may be lingering. Trust me, skipping this step can lead to all sorts of problems down the line, like the new sealant or adhesive failing to properly adhere to the surface.

Once the area is clean and dry, you’ll need to inspect the molding itself to determine the extent of the damage. If the molding is cracked or severely damaged, you may need to replace it entirely. But if it’s just starting to peel or lift, you may be able to salvage it with a little elbow grease.

If the molding is still in relatively good shape, you’ll want to use a sharp utility knife or razor blade to carefully remove any loose or peeling sections. This will ensure that the new sealant or adhesive has a clean, even surface to bond to. And be sure to thoroughly clean the area again after removing any old sealant or adhesive residue.

Choosing the Right Sealant or Adhesive

With the surface properly prepared, it’s time to select the right sealant or adhesive for the job. Now, I know what you might be thinking: “How hard can it be to choose a sealant?” But trust me, there’s more to it than you might think.

You see, not all sealants and adhesives are created equal when it comes to RV corner moldings. You’ll want to look for a product that is specifically formulated for use on RV surfaces, as these tend to be more flexible and durable than your standard household caulk or adhesive.

One of the most popular options for RV corner molding repair is a silicone-based sealant. Silicone sealants are known for their excellent adhesion, flexibility, and resistance to the elements. They can also be easily tooled and smoothed to create a professional-looking finish.

Another option is a butyl-based sealant, which is known for its superior water-resistance and longevity. These sealants are often used in RV manufacturing and can be a great choice for resealing corner moldings that are prone to leaks.

Ultimately, the choice will depend on the specific condition of your RV’s corner moldings and your personal preferences. But no matter which route you choose, be sure to carefully read the manufacturer’s instructions and follow them to the letter for the best results.

Applying the Sealant or Adhesive

Alright, now that you’ve got the surface prepped and the right sealant or adhesive in hand, it’s time to put your handyman skills to the test and get to work. This is where the real magic happens!

First things first, you’ll want to make sure the area around the corner molding is well-ventilated and that you’re working in a clean, dry environment. Applying sealant or adhesive in damp or humid conditions can seriously compromise the integrity of the bond.

Next, you’ll need to carefully apply the sealant or adhesive to the prepared surface. If you’re using a caulking gun, be sure to cut the tip of the cartridge at a 45-degree angle to create a nice, smooth bead. And don’t be afraid to use a generous amount – you want to ensure complete coverage and a secure seal.

Once the sealant or adhesive is in place, you’ll need to use a putty knife or similar tool to smooth it out and ensure a clean, even finish. This will not only improve the appearance of the repair but also help the molding adhere more securely to the surface.

And remember, patience is key here. You’ll want to allow the sealant or adhesive to fully cure according to the manufacturer’s recommended timeframe before reinstalling the molding or putting the RV back on the road. Trust me, skimping on this step can lead to all sorts of headaches down the line.

Reinstalling the Corner Molding

With the sealant or adhesive cured and ready to go, it’s time to reinstall the corner molding. Now, this is where things can get a bit tricky, so pay close attention.

First, you’ll want to carefully align the molding with the corner joint, making sure it’s positioned exactly where you want it. And here’s a pro tip: apply a small amount of the sealant or adhesive to the back of the molding before pressing it into place. This will help create an extra-strong bond and prevent any future peeling or lifting.

As you press the molding into place, be sure to apply firm, even pressure along the entire length to ensure a secure seal. And don’t be afraid to use a roller or other tool to help smooth out any bumps or wrinkles.

Once the molding is in place, you’ll want to let it sit for the recommended curing time before taking your RV out on the road. This will give the adhesive or sealant ample time to fully set and create a lasting bond.

Maintaining Your RV’s Corner Moldings

Alright, now that you’ve gone through the process of repairing and resealing your RV’s corner moldings, it’s important to remember that the job doesn’t end there. Proper maintenance is key to keeping those moldings in tip-top shape for the long haul.

One of the most important things you can do is to regularly inspect your RV’s corner moldings for any signs of wear or damage. This means taking the time to carefully examine each corner, looking for any cracks, peeling, or gaps that might indicate a problem.

And when it comes to cleaning those moldings, be sure to use a high-quality RV-specific cleaner and a soft, non-abrasive cloth. Avoid using harsh chemicals or scrubbing too aggressively, as this can damage the delicate material and compromise the seal.

Another important maintenance tip is to be mindful of your RV’s movement and the stresses it places on the corner moldings. Whenever possible, try to avoid sudden stops, sharp turns, and other maneuvers that could cause the moldings to flex and strain. And be extra vigilant when navigating tight spaces or backing up, as even a minor impact can dislodge or crack the molding.

By staying on top of regular inspections and maintenance, you can help ensure that your RV’s corner moldings remain in top condition for years to come. And trust me, the peace of mind that comes with knowing your rig is protected from the elements is worth its weight in gold.

The Bottom Line: Keeping Your RV Corner Moldings in Tip-Top Shape

Well, there you have it, folks – my comprehensive guide to repairing and resealing RV corner moldings. From understanding the anatomy of these crucial components to mastering the art of proper maintenance, I’ve covered all the bases to help you keep your RV in pristine condition.

Remember, addressing corner molding issues head-on is crucial to preserving the structural integrity and aesthetic appeal of your beloved RV. And with the right tools, techniques, and a little bit of elbow grease, you can tackle this common maintenance task like a pro.

So, what are you waiting for? Grab your toolbox, fire up that RV, and let’s get to work! And if you ever find yourself in a jam and need a little extra help, don’t hesitate to reach out to the experts at We’re always here to lend a hand and keep your RV rolling smoothly down the road.