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Bonding Timber Components with Sikaflex



Description of the Application

In yachts and pleasure craft as well as in ocean-going vessels, stairs, companionways and handrails are frequently made from tropical hardwood, chosen both for their durability and their attractive appearance.

The use of screws to attach these fixtures can impair both their durability and their appearance as they are vulnerable to moisture gaining access through the fixing holes. Hardwood components like these can be fixed with adhesives, where the absence of screw holes leaves the wood unimpared and more resistant. This is of particular importance where the wood is load-bearing as in the construction of accommodation ladders.

Bonding also has other benefits. The resilient adhesive layer softens the sound of footsteps and cushions vibrations, the integrity of painted surfaces can be preserved without loss of corrosion protection, and the effects of moisture penetration are eliminated.

Preparation of Substrate

Timber, Aluminium or Steel Coated with Two-Part Lacquer

Ensure that the treated metal deck is compatible with Sikaflex-291 or Sikaflex-298 otherwise sandblast off the treatment down to the metallic surface and use SikaCor ZP Primer
Lightly abrade the contact area with a very fine sanding pad
Remove all dust with a vacuum cleaner
Treat the substrate with Sika Aktivator, using a clean lint-free rag or paper towel. Change the rag frequently!
Flash-off: 10 minutes (min) to 2 hours (max)

Untreated Timber (Teak, Mahogany)

Abrade the contact area on the hull with a sanding pad (80/100 grit)
Remove the dust with a vacuum cleaner
Apply a thin, continuous coat of Sika Primer-290 DC LOT, using a clean brush or a felt applicator on Teak. Use Sika Primer-215 on mahogany
Drying times:
Sika Primer-290 DC LOT: 30 minutes (min) to 3 months (max)
Sika Primer-215: 30 minutes (min) to 24 hours (max)

Stainless Steel, e.g. Ladders 208

Heavily soiled surfaces should first be cleaned off with a pure solvent (Sika Remover-208) to remove the worst of the soiling
Lightly abrade the contact area with a very fine abrasive pad
Remove the dust with a vacuum cleaner
Pretreat the substrates with Sika Aktivator, using a clean, lint-free rag or a paper towel. Change the rag frequently!
Flash-off: 10 minutes (min) to 2 hours (max)
Apply a thin, continuous coat of Sika Primer-210, using a clean brush or a felt applicator
Drying time: 30 minutes (min) to 24 hrs (max)

Applying Sikaflex-298 or -291 Adhesive

Flat surfaces: Sikaflex-298 or -291
Inclined surfaces: Sikaflex-291 Apply the adhesive to the previously prepared surface and spread over the area to be covered using a spreader with 2 mm triangular notches. The thickness layer should be about 0.5 - 1 mm
The timber component must be placed in position within 30 minutes of applying the adhesive, so the adhesive should be applied only to an area large enough to receive the section of covering and fix the component to ensure that the bonded composite is left for at least 24 hours

Do not use Sika Aktivator or any other cleaning agent or solvent for cleaning purposes



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