Sikaflex-221 black polyurethane sealant & adhesive
One-component urethane sealant that bonds to metals and plastics, with aging resistance and compatibility with coatings. Customers note strong adhesion and durability, but some report difficulty in extrusion and color accuracy issues
Highlights
- certified for drinking water contact
- multi-substrate adhesion
- sandable and paintable
Pros
- bonds to metals and plastics
- one-component urethane
- age resistant
- sandable/paintable
- NSF approved for drinking water
Cons
- hard to get out of the tube
- color accuracy issues
- adhesion and durability mixed feedback
Best For
Features
- One-component polyurethane sealant for bonding to metals, plastics, and metal primers/coatings
- Formulated for aging resistance and endurance against seawater, diluted acids, and caustic solutions
- Ready-to-use cartridge compatible with electric, pneumatic, or manual application guns
