3M 08374 MSP Sprayable Seam Sealer, Gray Paste, Immediate-Paint, 10.5 fl oz Cartridge
- Designed for professional collision repair, this single-component, moisture-curing seam sealer can be caulked or spray-applied to replicate OEM seams and coatings on door skins, quarter panels, trunk and floor pans. It adheres strongly to properly primed metal and aluminum and can be painted immediately to speed cycle times in dealerships and collision centers.
- Features:
- Single-component modified silane polymer formula; no mixing required
- Apply as a bead, sprayed seam, or sprayed coating to match OEM textures
- Excellent adhesion to primed metal and aluminum; not recommended over acrylic lacquer
- High solids (approx. 97%) with very low solvent content for minimal shrink
- Paintable immediately after application (maintains paint adhesion within the recommended window)
- Compatible with 3M Sprayable Seam Sealer Applicator Gun PN 08400
- Specifications:
- Part No.: 8374
- Product Line: MMM
- MFR Model: 08374
- Applications: For bare metal, door hem flanges, door jambs, door skins, exterior seams and joints, floor pans, galvanized, general purpose, interior seams and joints, joint filling, rear body panels and rocker panels
- Manufacturer: 3M Products
- Alternate Part Number-1: 60980031284
- UPC: 051135083741
- Brand: 3M
- Applicable Materials: Bare Metal
- Application Time: 5 to 10 min
- Paintable (Y/N): Yes
- Specific Gravity: 1.4 to 1.6
- Sprayable (Y/N): Yes
- Color: Gray
- Flash Point: 144 deg F
- Container Size (oz): 10.5
- Container Type: Cartridge
- Form: Paste
- Temperature Rating (deg F): -20 to 200
- Curing Time: 24 hr
- The 3M MSP Sprayable Seam Sealer can also be referred to as automotive sprayable seam sealer, moisture-curing seam sealer, gray seam sealer cartridge, OEM texture seam sealer, and 3M 08374 seam sealer.
3M is a global leader in automotive aftermarket solutions, offering adhesives, seam sealers, coatings, abrasives, and finishing systems trusted by OEMs and collision centers. Their science-driven products help improve repair quality, consistency, and throughput across body shops and dealerships.
Q: Can I apply this seam sealer directly over bare metal?
A: For best results, apply over properly cured automotive primer; applying over bare metal does not provide adequate corrosion protection.
Q: How soon can I paint over the sealer after application?
A: It is paintable immediately after application within the recommended paint window noted in the directions.
Q: What tool do I need to spray this product to replicate OEM textures?
A: Use the 3M Sprayable Seam Sealer Applicator Gun PN 08400 and adjust air/pressure settings per the technical data sheet to create beads, sprayed seams, or coatings.
Q: What primer types are compatible or not recommended?
A: The product adheres well to primed surfaces, except acrylic lacquer. If an acid-etching primer was used, allow it to fully cure before applying the seam sealer.
Q: How should I store unopened cartridges?
A: Store at room temperature and rotate stock first-in, first-out. Unopened product has a 12-month shelf life under recommended conditions.
