SIS-440 is a top-selling caulking product and a proven leader in the marine industry.
This one-part, neutral-cure paste requires no primer. When exposed to moisture in the air, it reacts to form a tough, flexible rubber that is non-corrosive to all substrates. Once cured, it provides excellent chemical and temperature resistance for long-lasting performance in marine environments.
Benefits of SIS-440:
No primer required
One-part polymer adhesive/sealant – cures to flexible rubber
Permanent adhesion
High UV and weather resistance
Minimal sagging and shrinkage
Rapid curing (20–40 min)
Available in black, white, and gray