3M 08364 Urethane Seam Sealer, Beige, 310 mL Foil Pack, 24 hr Curing

3M 08364 Urethane Seam Sealer, Beige, 310 mL Foil Pack, 24 hr Curing

• The 3M Urethane Seam Sealer (part number 08364) is a high-solids, single-component urethane seam sealer—ideal for sealing automotive and RV seams, joints, and weld-through areas with permanent flexibility and corrosion resistance.
• Features:
  • Single-component, moisture-curing formula — adheres to bare, primed, or painted metal and cures even in high-heat or high-humidity conditions
  • Non-shrinking and non-cracking elastomer — remains permanently flexible for durability and tight seals
  • Thick paste consistency — fills large voids; can be smoothed to a featheredge or brushed for clean finishes
  • Fast paintability — tack-free and ready for topcoat in as little as 30 to 45 minutes
  • Weld-through capable — can be applied prior to squeeze-type resistance spot welding for sealed joints
• Specifications
  • Part No.: 8364
  • Product Line: MMM
  • MFR Model: 8364
  • Standard/Approvals: California Pro65 Warning: Cancer and Reproductive Harm
  • Applications: For general-purpose automotive seams, including door skins, rocker panels, rear body panels, trunk seams, floor pans and more
  • Manufacturer: 3M Products
  • Alternate Part Number-1: 60455030910
  • UPC: 051135083642
  • Brand: 3M
  • Applicable Materials: Bare Metal, Painted Surfaces, Primed Metal
  • Application Time: 10 to 20 min
  • Paintable (Y/N): Yes
  • Specific Gravity: 1.17
  • Sprayable (Y/N): Yes
  • Base Type: Moisture-Curing Urethane
  • Component: 1K
  • Color: Beige
  • Container Size (mL): 310
  • Flash Point: 92 deg F
  • Container Type: Flex-Pack
  • Form: Paste
  • Temperature Rating (deg F): -25 to 180
  • Type: 1-Component
  • Curing Time: 24 hr
  • Part Number 08364, 3M ID 7100049259, UPC 051135083642
• The 3M 08364 can also be referred to as UltraPro urethane seam sealer, beige seam sealer, urethane paste seam sealer, moisture-cure seam sealer, automotive/RV seam filler.

3M’s Urethane Seam Sealer (PN 08364) is a premium, one-component, moisture-curing sealant engineered for robust, long-lasting sealing in automotive and RV applications—offering excellent adhesion, flexibility, and fast paint readiness even under harsh conditions.

Q: Can this sealer be used over painted surfaces?
A: Yes, the formula adheres well to bare, primed, or painted metal surfaces and cures via moisture—making it reliable even in humid or high-heat environments.

Q: How long before I can paint over the seam sealer?
A: The sealer becomes tack-free and paintable in about 30 to 45 minutes, enabling fast workflow and quick top-coating.

Q: Is this suitable for spot-welded seams?
A: Absolutely. It functions as a “weld-through” sealer, maintaining adhesion even when applied before squeeze-type resistance spot welding.