Bostik 940A
SMP marine adhesive sealant with a longer working time for larger or more detailed joints.
View Bostik 940AMarine application
General Marine Bonding & Sealing
General marine bonding and sealing covers the everyday joints, fittings and assemblies found across repair, refit and installation work. Product choice depends on what is being joined, how much the joint moves, and how quickly the work needs to progress.
Typical use cases
- —Bedding and sealing deck fittings
- —Sealing joints and seams
- —Bonding fiberglass and metal components
- —Panel and assembly bonding
Important selection factors
- —Substrates on each side of the joint
- —Joint movement in service
- —Working time versus fast set
- —Wet, salt or below-waterline exposure
- —Initial hold needed during assembly
- —Color
Choosing between 940A and 940A FS
Bostik 940A is the broad-use SMP option for marine bonding, sealing and perimeter work. Its longer working window is often useful for larger or detailed joints, and for work in warm Florida conditions where material can start to set sooner.
Bostik 940A FS is the faster-set option, for jobs where a shorter working and tooling window is acceptable and earlier progress matters.
Bostik 920 and 920 FS are the polyurethane alternatives. They are not positioned for UV-exposed bonding to glass. For current handling and cure figures, request the product documentation.
Common substrates & materials
- —Fiberglass / GRP
- —Aluminum, stainless steel and other metals
- —Wood
- —Selected plastics — some low-surface-energy plastics require review
Common problems & failure considerations
- —Low-surface-energy plastics such as polyethylene
- —Unidentified materials
- —Joints that need high initial hold without temporary support
Related Bostik products
Products used for general marine bonding & sealing
Suitability depends on the substrates and conditions of your application. If you are unsure, use Application Support.
Bostik 940A FS
Fast-set SMP marine adhesive sealant for work that needs to progress quickly.
View Bostik 940A FSBostik 920
Polyurethane marine sealant used where a flexible, high-movement sealed joint is required.
View Bostik 920Bostik 920 FS
Fast-set polyurethane marine sealant for sealed joints that need earlier handling.
View Bostik 920 FSBostik STR220A
Multipurpose elastic sealant for marine joints and seams, stocked in Black, Gray and White, with a Bostik-tested role in certain synthetic teak applications.
View Bostik STR220ABostik MSR CA SSKF
Marine construction adhesive for bonding and bedding deck coverings, fittings and components.
View Bostik MSR CA SSKFBostik STR360A
High green-strength adhesive for specialised panel and assembly bonding, reviewed before it is proposed.
View Bostik STR360ASurface preparation considerations
For demanding wet, salt or below-waterline conditions involving metal, GRP or glass, Prep M may be indicated as part of the preparation step.
Common questions
What is the difference between 940A and 940A FS?
Both are SMP marine adhesive sealants. 940A has the longer working window, often useful for larger or detailed joints and warm conditions; 940A FS is the faster-set option where a shorter tooling window is acceptable and earlier progress matters.
What is the difference between SMP and polyurethane options?
Iris offers both SMP (940A, 940A FS) and polyurethane (920, 920 FS) sealants. The right family depends on the substrates, exposure and joint — use Application Support to narrow it.
When should the application be reviewed?
When low-surface-energy plastics or unidentified materials are involved, or when a joint requires high initial hold.
Not sure which product fits?
Tell us about the materials and conditions and the Iris team will help narrow the appropriate Bostik options.