Maintenance Tips for Your Fiberglass Truck Cap

Aug 8 2025

Maintenance Tips for Your LEER Fiberglass Truck Cap

Keeping your LEER fiberglass truck cap in excellent shape not only extends its lifespan but also maintains the aesthetic appeal and resale value of your vehicle. Follow these maintenance tips to ensure your cap stays clean, damage-free, and well-protected year-round.
 

Establish a Regular Cleaning Schedule

Regular cleaning is essential for preventing buildup of dirt, grime, and contaminants that can damage the fiberglass surface over time.

  • Frequency: Aim to clean your truck cap every 2–4 weeks, depending on your location and how often you drive in dirty or dusty conditions. If you live near the ocean or in a high-pollution area, more frequent cleaning may be necessary.
  • Method: Use a mild automotive soap and a soft sponge or microfiber cloth to avoid scratching the finish. Rinse thoroughly with clean water and dry with a chamois or microfiber towel to prevent water spots.
  • Avoid Harsh Cleaners: Steer clear of abrasive cleaners or stiff brushes, which can dull or damage the gel coat surface.

If you're looking for even more ways to keep your fiberglass truck cap in top shape, check out our blog post on how to clean your fiberglass truck cap. It covers deeper cleaning methods, recommended products, and expert tricks to tackle tough grime and keep your cap looking like new.

 

Addressing Specific Issues
 
Fiberglass can show signs of wear over time. Here's how to handle common issues effectively:
  • Stains:
    • For tree sap, bird droppings, or other stubborn marks, use a fiberglass-safe cleaner or a diluted vinegar solution.
    • Always test new cleaners on a small, hidden area first to check for any adverse reactions like discoloration.
  • Scratches
    • Light Scratches: Use a fiberglass scratch remover or automotive polishing compound to buff them out. Apply with a soft cloth in a circular motion, then buff to a shine.
    • Deeper Scratches or Chips: If damage penetrates the gel coat, consider using a fiberglass repair kit or consulting a professional for refinishing.
 
Protecting Against Environmental Damage
 
Long-term exposure to sunlight, moisture, and extreme temperatures can degrade your fiberglass truck cap. Prevention is key.
 
  • UV Protection: 
    • Apply a UV-protectant wax or sealant formulated for fiberglass surfaces every 3–6 months. This helps maintain the shine and prevents fading or oxidation.
    • Products like marine waxes often work well for truck caps due to their added protection for fiberglass under harsh conditions.
  • Weather Considerations:
    • Shade Whenever Possible: Park in a garage, carport, or under trees to reduce exposure to sunlight and rain.
    • Use a Truck Cover: If you must park outdoors, invest in a high-quality, breathable cover that fits your truck and cap securely. Avoid plastic tarps, which can trap moisture and cause mildew.

 

Inspect Seals and Mounting Hardware
 
  • Rubber Seals: Check the rubber weather seals regularly for cracks, dryness, or damage. Worn seals can let in water and dust. Apply a rubber conditioner or replace seals as needed.
  • Clamps and Bolts: Inspect all mounting hardware for tightness and corrosion. Tighten loose clamps and replace rusted bolts to ensure the cap stays securely attached.
 
Interior Maintenance
 
If your truck cap has an interior lining, storage units, or electronics:
 
  • Vacuum or wipe down the interior regularly.
  • Keep vents and windows clean and check for leaks.
  • If there's lighting or other accessories, inspect wiring for wear or corrosion.

 

Seasonal Considerations
 
  • Winter: Snow and ice buildup can add excess weight. Gently brush off snow with a soft tool, never use metal shovels. Check for ice around seals that may cause leaks.
  • Summer: High heat can dry out seals and fade paint. Frequent waxing and conditioning are particularly important in warmer months.

 

By following these maintenance steps, you'll ensure your fiberglass truck cap remains both functional and attractive for years to come. A little routine care goes a long way toward protecting your investment.