Taking Care of Seals: How to Re-Seal and Maintain Your RV

Your RV is more than just a vehicle — it’s your home on wheels. But like any home, it needs care. One of the most important parts of RV maintenance is taking care of the seals. 

Seals are the protective barriers around your windows, doors, roofs, and slide‑outs. They keep water, dust, and air from sneaking inside. If seals wear out or crack, leaks can happen — and leaks can lead to costly damage.

What are RV Seals? 

Each exterior component installed on an RV is sealed to the body using a primary gasket, typically made of butyl tape or rubber, which is designed to prevent water intrusion. A secondary seal—usually silicone or a similar sealant—is applied to sidewall components such as windows, doors, and mouldings for added protection. 

For roof-mounted components like vents, the secondary seal is a lap sealant specifically designed to bond to the roof membrane. Additional sealing elements, such as rubber flaps, are used on slide rooms and movable doors to help create a barrier against water and dust intrusion as these components operate.  

Seals protect your RV from: 

• Compartment seals: Protect storage areas from moisture. 

• Water damage: Leaks from rain and snow can cause rot, mold, and costly repairs. 

• Heat loss: Worn seals let warm air escape and cold air in. 

• Dust and dirt: Seals keep your RV cleaninside. 

• Pests: Ants, spiders, and other critters can sneak in through gaps.

They also help to keep drafts out, lower your heating/cooling energy levels, and protect your storage areas from unwanted moisture. 

How to Check Your Seals: You don’t need to be a mechanic to spot seal issues. A simple walk‑around can reveal a lot. 

• Look for cracks: Take a slow walk around your RV and pay close attention to the caulking around windows, roof edges, and seams. Cracks may look small, but even tiny openings can let water in. Use a flashlight if needed to spot hairline breaks. If you see peeling or gaps in the caulking, it’s a sign the sealant is drying out and needs to be replaced. 

• Check for gaps: Run your hand along the door frame and slide‑out seals. You should feel a smooth, snug strip of rubber or vinyl. If you notice loose spots, uneven edges, or areas where the seal doesn’t press firmly against the surface, that’s a gap. Gaps allow drafts, dust, and even insects to sneak inside. A simple touch test can reveal problems you might miss with your eyes alone. 

• Watch for discoloration: Healthy seals are usually dark and flexible. If you notice seals turning yellow, gray, or chalky, it means they’re breaking down. Brittle seals may crack under pressure, and faded color often signals UV damage from the sun. Discoloration is an early warning sign — catching it now can prevent leaks later. 

What to Do if You Suspect a Leak: 

One of the easiest (but potentially more hazardous) ways to check seals is with a garden hose. Spray lightly around windows, doors, and roof seams, then step inside your RV. Look for drips, damp spots, or fogging near the edges. If moisture sneaks in, your seals aren’t doing their job. 

However, a safer way to resolve a suspected leak issue is to bring the unit into Arrkann RV to have our certified tech diagnosis. That way, you won’t cause more harm with an at-home test, and our team can fix any small problems before they become large costly ones! 

How to Maintain Seals:  

• Clean regularly: Use mild soap and water to remove dirt. 

• Condition rubber seals: Apply seal conditioner to keep them flexible. 

• Re‑caulk when needed: Replace cracked caulking with RV‑safe sealant. Check with an Arrkann advisor to help you learn what is the best type of sealant for your unit. (CTA) 

• Inspect after trips: Long drives can loosen seals. 

Arrkann RV’s maintenance packages include cleaning, conditioning, and re‑sealing. Let our team handle the details so you can focus on the fun. 

When to Re-Seal Your RV: Seals don’t last forever. Depending on weather and use, they may need to re‐seal every 12–24 months. 

Signs it’s time: 

• Visible cracks or peeling: Take a close look at the caulking around your roof, windows, and seams. If you notice cracks, peeling edges, or areas where the sealant looks dried out, that’s a red flag. 

• Water stains inside the RV: Check ceilings, walls, and corners for discoloration or soft spots. Brown or yellow stains often mean water has already found its way inside. Left untreated, leaks can lead to mold, rot, and expensive repairs. 

• Drafts near windows or doors: On a cool evening, run your hand around the edges of your windows and doors. If you feel air sneaking in, your seals aren’t tight anymore. Drafts make your RV less comfortable, forcing your furnace or AC to work harder. 

• Difficulty closing compartments: If storage doors or compartments don’t shut smoothly, the seals may be worn, misaligned, or compressed. Forcing them closed can damage both the seal and the door. A snug, easy close is what you want — anything less means it’s time to inspect and possibly replace the seals.  

Alberta’s freeze‑thaw cycles can wear seals faster. Schedule re‑sealing before winter and after spring thaw. 

Benefits of Regular Seal Maintenance: Taking care of seals saves money and stress. 

• Prevent costly repairs: Water damage can cost thousands to fix. Even a small leak left untreated can spread quickly, leading to structural issues and mold that compromise both safety and usability. 

• Improve comfort: No drafts, no leaks, just cozy camping. Proper seals also help your heating and cooling systems run more efficiently, saving energy and keeping your RV comfortable in every season. 

• Extend RV life: A well‑sealed unit lasts longer. By protecting against rot, rust, and premature wear, strong seals ensure your RV stays road‑ready for years of adventures. 

• Boost resale value: Buyers look for RVs with strong seals. A history of regular seal maintenance reassures them that the unit has been cared for, making it easier to sell or trade at a higher price. 

Ask about Arrkann RV’s maintenance packages — they’re designed to keep your unit protected year‑round. 

Arrkann RV Maintenance Packages 

We know life gets busy. That’s why we offer maintenance packages that include: 

• Full seal inspection 

• Re‑sealing of roof, windows, doors, and slide‑outs 

• Full system check 

• Seasonal check‑ups 

Book your safety check today at Arrkann RV. Protect your investment and enjoy worry‑free camping. 

Final Thoughts 

Seals may be small, but they’re mighty. They protect your RV from leaks, drafts, and damage. With regular care — and help from Arrkann RV’s maintenance packages — you’ll enjoy safe, comfortable adventures across Alberta and beyond.