Criterion
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Main job
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Chemistry
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Shore A hardness
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Skin time
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Approval stated by Sika
Sikaflex Marine Range
Marine Sealants & Adhesives
A marine sealant is an elastic compound that seals and bonds joints on board while the structure keeps moving — vibration, thermal expansion, hull flex. It cures in the joint into a rubber that takes the movement instead of cracking.
Trivaro supplies the Sikaflex marine range — 291i for joints, 292i for structural bonding, 295 UV for glazing, 591, teak deck caulking and bedding, fire-rated SikaFiresil Marine N — together with the activators and primers they go over, delivered across Europe with data sheets.
Shore A 25–45
Cured rubber
−50…90 °C
Service range
300 / 600 ml
Cartridge / unipack
WheelmarkIMO FTP Code1-Component
Joints that move with the ship.
Bonding That Moves
Why Joints on Board Are Elastic
A ship is never still. A rigid joint cracks at the first season of vibration and temperature swing — an elastic one is designed for it. That changes six things.
Movement is absorbed
The cured bead stretches and recovers, so hull flex, engine vibration and thermal expansion stay in the joint instead of opening it.
Seal and bond in one bead
The same bead keeps water out and holds the part in place — fittings, hatches, rub rails and panels are sealed and bonded in one operation.
Dissimilar materials, one joint
Aluminium to GRP, steel to glass, teak to deck: an elastic adhesive bridges materials that expand at different rates.
One component, cures in air
Nothing to mix on deck. The cartridge cures with atmospheric moisture — skin in 15 to 90 minutes depending on the product.
Fire rules are covered
Wheelmark-approved grades for accommodation and interior joints, and a fire-retardant silicone for joints in fire-rated divisions.
Paintable and sandable where needed
Interior grades can be overpainted; teak deck caulking is sanded flush with the deck like the timber around it.
Which Sikaflex for Which Job
Rule of thumb: 291i for joints, 292i when the bond carries load, 295 UV when glass or sunlight is involved, 591 when one product must do interior and exterior. Teak decks and fire-rated joints have their own products.
Sikaflex-291i
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Multipurpose joint sealing, interior
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1-C polyurethane
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40
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~60 min
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Wheelmark
Sikaflex-292i
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Structural bonding of components
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1-C polyurethane
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40
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~40 min
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Wheelmark
Sikaflex-295 UV
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Direct glazing (PC, PMMA), exterior sealing
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1-C polyurethane, UV-resistant
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35
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~60 min
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Wheelmark
Sikaflex-591
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Sealing & bonding, in and out, above and below waterline
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1-C silane-terminated polymer
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45
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~35 min
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FTP Code Part 5 tested
The Range We Supply
Seven sealants and adhesives and four pre-treatments from the Sika marine programme. Tell us the joint and the two materials — we return the product and its primer.
Sealing & Bonding
- Where: deck fittings, hatches, interior joints, components, panels
- Products: Sikaflex-291i (white, black), Sikaflex-292i (white), Sikaflex-591 (white, steel grey, black)
- Earns: elastic, vibration-resistant joints and load-bearing bonds in one bead
Glazing & Exterior
- Where: organic-glass windows (PC, PMMA), exterior joints exposed to sun and weather
- Products: Sikaflex-295 UV (black, white)
- Earns: a UV-resistant bond and seal for windows and exposed joints
Teak Decks
- Where: traditional timber decking and synthetic deck coverings
- Products: Sikaflex-290 DC PRO for caulking the seams, Sikaflex-298 FC for bedding the strips, SikaPrimer-290 DC beneath both
- Earns: a caulk line sanded flush with the timber and fully bedded deck strips
Fire-Rated Joints
- Where: joints in fire-rated divisions, panel and penetration seals
- Products: SikaFiresil Marine N — fire-retardant neutral-cure silicone, −40…150 °C
- Earns: low flame spread to the IMO FTP Code, Part 5
How an Elastic Joint Is Made
Four steps. Skipping the second one is the most common reason a marine joint fails.
01
Clean
Bond faces dry, free of dust, grease and release agents. Old sealant is removed mechanically.
02
Activate or prime
Sika Aktivator-205 on non-porous faces, SikaMultiPrimer Marine on metals and timber, SikaPrimer-290 DC on teak decks — and the flash-off time respected.
03
Apply & tool
Bead from the cartridge or unipack, tooled within the skin time. Joint dimensions follow the data sheet, not the gap that happens to be there.
04
Cure
The bead cures with air humidity from the surface inwards. Load, sanding or overpainting wait until the data sheet says so.
Related Products & Reading
What sits under the joint and next to it on deck.
Sika marine deck system↗
The whole Sika range in build-up order — Sikafloor Marine-109/119 screeds, primers, teak deck caulking and which Sikaflex for which joint.
Marine resin deck coverings↗
Epoxy and polyurethane deck systems — the jointless alternative to sealed sheet floors.
IMO / MED certification↗
What Wheelmark, MED modules and the FTP Code mean for products on board.
Marine deck coverings↗
The full programme — screeds, A-60 systems, primers, insulation and coverings.
Marine Sealants — Frequently Asked Questions
What yards, boatbuilders and superintendents ask before ordering.
01 What is a marine sealant?
An elastic, one-component compound that seals and bonds joints on board while the structure keeps moving — vibration, thermal expansion, hull flex. Most are polyurethane or silane-terminated polymer and cure with air humidity into a rubber of around Shore A 25–45. The cured bead takes the movement instead of cracking — which is why it is used for fittings, hatches, glazing, teak decks and interior joints.
02 Which Sikaflex should I use?
291i — multipurpose joint sealing. 292i — structural bonding of components. 295 UV — direct glazing of PC/PMMA and exterior sealing. 591 — sealing and bonding inside and out, above and below the waterline. 290 DC PRO caulks teak deck seams, 298 FC beds teak strips and synthetic deck coverings, and SikaFiresil Marine N seals fire-rated joints.
03 Are Sikaflex marine sealants IMO or Wheelmark approved?
Sikaflex-291i, 292i and 295 UV are Wheelmark approved under the EU Marine Equipment Directive. SikaFiresil Marine N is stated as IMO approved for low flame spread (FTP Code Part 5), and Sikaflex-591 is tested to the 2010 FTP Code Annex 1, Part 5. For Sikaflex-290 DC PRO and the Sikaflex-298 range Sika states that they meet IMO requirements. Data sheets come with every order; certificates are obtained from Sika for your classification file on request.
04 Do I need an activator or primer?
Usually yes — adhesion is decided by the pre-treatment, not the sealant. Aktivator-205 for non-porous faces (metals, plastics, painted surfaces), SikaMultiPrimer Marine for metals and timber before polyurethane Sikaflex, SikaPrimer-290 DC for teak, mahogany and GRP before deck caulking or bedding. Confirm the combination against Sika’s pre-treatment chart and test it on the actual material.
05 Polyurethane or silane-terminated polymer?
Polyurethane (291i, 292i, 295 UV, 290 DC PRO, 298 FC) is the classic marine chemistry with the widest approvals. Sikaflex-591 is a silane-terminated polymer — one product for interior and exterior sealing and bonding, above and below the waterline, with a 35-minute skin time and Shore A 45. Choose by the job and by the approval your class or flag requires.
06 What packs do you supply, and how fast?
Sealants in 300 ml cartridges (boxes of 12) and 600 ml unipacks (boxes of 20); activators and primers in 250 ml and 1000 ml cans. Stock items ship from Sika’s Baltic and Finnish warehouses, typically within about a week; SikaFiresil Marine N is made to order in one to three weeks. Send quantities and the delivery port for a B2B quotation.
Sealing or Bonding on Board?
Trivaro supplies the Sikaflex marine range across Europe — sealants, structural adhesives, glazing and teak deck products, fire-rated silicone and the activators and primers beneath them, with data sheets for your file.
Send the joints, the materials on each side and the quantities. We respond with the product and pre-treatment per joint and a B2B quotation.
