3M™ MSP Sprayable Seam Sealer 08374
3M™ MSP Sprayable Seam Sealer 08374 is a versatile, single-component, moisture-curing seam sealer ideal for automotive body seams and general seam sealing where quick application, adhesion, and paintability are needed. It can be used for both caulked beads and sprayed coatings, offering flexibility and professional performance in collision repair and vehicle manufacturing.
Key Features
One-component moisture-curing formula – no mixing required and easy to use.
Versatile application – can be applied as a bead with a caulking gun or sprayed using a sprayable seam sealer applicator.
High-performance seam sealer formulated for automotive body panel joints.
Excellent adhesion to primed surfaces (works on most primers except acrylic lacquer).
Non-shrinking, non-cracking finish that provides long-lasting seals.
Fast cure and paintability – becomes tack-free in about 30 minutes and is usually paintable immediately after application.
Applications
3M MSP 08374 is commonly used for sealing and protecting seams in automotive bodies and metal panels:
Sealing door skins, trunk seams, rear body panels.
Filling floor pans, rocker panels, and quarter panels.
Interior and exterior seams in automotive body repair and manufacturing.
Can also be used as a coarse textured coating for undercarriage sound-deadening or protection areas.
Product Data | |
| Property | Typical Value / Description |
| Color | Gray |
| Base / Cure Type | Moisture-curing modified silane polymer |
| Form | Paste you can caulk or spray |
| Container | ~10.5 fl oz cartridge (approx 310 mL) |
| Consistency | Thick paste, sprayable with appropriate gun |
| Cure Mechanism | Moisture-activated |
| Tack-free Time | ~30 min (ambient moisture cure) |
| Paintability | Immediate after cure |
| Application Options | Caulking or spraying with applicator gun (e.g., 08400) |
Safety & Handling
Always consult the official Safety Data Sheet (SDS) before use for full hazard and protective information. Key precautions typical for seam sealers include:
Avoid skin and eye contact – chemical sealers can cause irritation.
Use in a well-ventilated area – moisture cure and solvent components may emit vapors.
Wear PPE: gloves, eye protection, and appropriate work clothing.
Keep away from heat and open flames during application and storage.
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