How to Install Convertible Top Header Seals

What Is a Header Seal?

The header seal (also called front bow weatherstrip) creates the critical seal between your convertible top and the windshield header. This is the #1 source of water leaks on convertibles—when it fails, water drips directly onto your dashboard and front seats.

Before You Begin

Gather Your Supplies:

• New header seal from Metro Moulded Parts
• 3M Black Weatherstrip Adhesive (GL-11)
• 7-Piece Trim & Pry Tool Set (GL-30) for removal
• Nitrile Gloves (GL-10)
• Lacquer thinner or adhesive remover
• Clean rags
• Retainer clips (if applicable to your vehicle)

💡 Pro Tip: For all the tools and adhesive you need in one purchase, consider the Complete Installation Kit (GLK-1).

Step-by-Step Installation

Step 1: Prepare the Work Area

1. Raise your convertible top to a comfortable working height.
2. Latch the top to the windshield header in the closed position.
3. Ensure the area is clean, dry, and above 60°F (15°C) for proper adhesive cure.

Step 2: Remove the Old Header Seal

1. Unlatch the top from the windshield header.
2. Using a trim tool, carefully pry out the old weatherstrip.
3. Remove any retainer clips—note their positions for reinstallation.
4. Critical: Scrape all old adhesive residue from the header channel. Old glue underneath new rubber causes poor adhesion and leaks.
5. Clean the channel thoroughly with lacquer thinner and allow to dry completely.

Step 3: Dry-Fit the New Seal

1. Do not apply adhesive yet.
2. Position the new header seal in the channel, starting from the center and working outward.
3. Check alignment at both ends—the seal should terminate precisely at the corners where it meets the roof rail seals.
4. Note any trimming required (measure twice, cut once).

Step 4: Apply Adhesive

1. Apply a thin, continuous bead of 3M Black Weatherstrip Adhesive to the header channel.
2. Also apply a light coat to the back of the weatherstrip.
3. Allow adhesive to become tacky (typically 2-5 minutes, depending on temperature).

Step 5: Install the Header Seal

1. Start at the center and press the seal firmly into the channel.
2. Work toward each end, ensuring the seal sits evenly without stretching.
3. If your seal uses retainer clips:
   • Install clips at their original positions
   • Still apply adhesive between clips to prevent gapping
4. Press firmly along the entire length to ensure complete contact.

Step 6: Final Steps

1. Install any chrome or stainless trim pieces that cover the seal edge.
2. Keep the top latched in the closed position for 24 hours to allow proper adhesive cure and seal compression.
3. Latch and unlatch the top several times to help the seal conform.

What to Expect After Installation

⚠️ Important: New Metro SUPERsoft rubber is intentionally slightly oversized to ensure a watertight seal. You may notice:

• Increased resistance when latching the top (first 1-2 weeks)
• The seal appearing "too thick" initially

This is normal. The rubber requires a break-in period of several days to two weeks to compress and conform to your header. The fit will improve with use.

Troubleshooting

Related Articles

• How to Install Convertible Top Rear Bow Seals
• Complete Convertible Top Weatherstrip Kit Installation Guide