3M 08308 Heavy Bodied Automotive Seam Sealer, Paste, Black, 7 fl. oz. Cartridge

3M 08308 Heavy Bodied Automotive Seam Sealer, Paste, Black, 1.16, 6 min Application, 1 hr Curing, 7 fl. oz. Cartridge

• 3M 08308 Heavy-Bodied Seam Sealer is a two-part epoxy sealant in a self-mixing dual-cartridge, designed for automotive seam sealing on door skins, floor pans, trunk floors, roof seams, and more; it cures rapidly to form a tough, flexible, non-sagging bead.
• Features
  • Two-part epoxy in dual-syringe cartridge ensures precise mix ratio and eliminates manual mixing mess
  • Heavy-bodied, paste-like consistency resists flow and allows tooling to match OEM seam seal appearances
  • Fast curing—fully cures in about one hour, tack-free in about ten minutes, work time approximately six minutes
  • Paint over in thirty minutes to maintain workflow efficiency
  • Flexible, durable seal resists shrinking or cracking across varying temperatures
• Specifications
  • Part No.: 8308
  • Product Line: MMA
  • MFR Model: 8308
  • Standard/Approvals: OSHA 29 CFR 1910.1200
  • Manufacturer: 3M Products
  • Brand: 3M
  • Composition: 40 to 80% Epoxy Resin, 10 to 30% Epoxy Resin, 3 to 7% Dimethyl Siloxane, Reaction Product with Silica, 0.5 to 1.5% Carbon Black
  • Application Time: 6 min
  • Specific Gravity: 1.16
  • Odor/Scent: Epoxy
  • Color: Black
  • Flash Point: 239 deg F
  • Container Size (oz): 7
  • Container Type: Cartridge
  • Form: Paste
  • Temperature Rating (deg F): -20 to 180
  • Type: Heavy Bodied
  • Curing Time: 1 hr
  • Part Number 08308, 3M ID 60980034908, UPC 051131168084
• The Heavy-Bodied Seam Sealer can also be referred to as automotive seam sealant, epoxy seam sealer, self-mixing seam sealer, OEM-match seam sealer, and high-performance seam sealer.

The 3M Heavy-Bodied Seam Sealer delivers industrial-grade sealing performance with precise mix control and fast cure speed. Designed by 3M for professional automotive body repair, it offers reliable sealing, easy toolability, and OEM-quality appearance.

Q: What surfaces is this seam sealer compatible with?
A: It is suitable for automotive surfaces such as door skins, floor pans, trunk floors, and roof seams, including properly primed or painted metal surfaces (e.g., 2K urethane or epoxy primer).

Q: How long is the open working time before it begins to cure?
A: The work time is approximately six minutes, giving you sufficient time to apply and smooth the bead before it begins to cure.

Q: When can I paint over the seam sealer?
A: You can safely paint over the cured bead in about thirty minutes, helping reduce downtime and keep your workflow moving efficiently.