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.
