3M Urethane Seam Sealer 08367, Black, 310 mL (2-pack)
Urethane seam sealer that remains flexible and non-shrinking, suitable for bare metal and painted surfaces. Customers note ease of application and good sealability, with some concerns about adhesion strength and top-coat drying
Highlights
- high solids formulation
- permanently flexible after curing
- suitable for high heat and humidity environments
Pros
- remains flexible
- non-shrinking, moisture-curing
- easy to apply
Cons
- mixed feedback on adhesive strength
- some report paint won't dry on top
- tacky texture reported by some
Best For
Features
- Single-component formula adheres to bare metal, primed metal, and painted surfaces
- Moisture-curing for performance in high heat and humidity environments
- Non-shrinking and remains flexible, surpassing solvent-based sealers
- Paintable after 30–45 minutes for flexible scheduling
- Thick consistency fills large voids and smooths to featheredge
