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Bonding Rub Rails and Fenders with Sikaflex


Application Description

Rub rails and fenders are designed to protect the hull of a vessel against damage. These act as a bumper to absorb impacts and scrapes, and the more elastic these are, the more effectively they perform this function.

The elastic behaviour varies according to the type of material used, so the shock-absorbing performance of the rub rail can be significantly improved by the use of an elastic adhesive joint. This provides maximum protection to the hull.

Rub rails of timber, PVC or polyurethane can be securely bonded to marine hulls using Sikaflex-292. The resulting elastic joint helps to absorb most of the shear and tensile stresses to which they are subjected when a vessel is docking or casting off.

If rub rails are secured with screws, a similar effect can be obtained by backfilling the rail profile with Sikaflex-291; a highly elastic polyurethane sealant. As well as absorbing torsional stresses, this technology also seals the screw holes and prevents water or dirt from getting behind the rub rail.

If the rub rail has a different chemical composition and is not fixed using a mechanical fixing method, please seek advice from your local Sika company



Bonding Rub Rails to the Hull

Substrate Preparation
GRP Hulls

Heavily soiled surfaces should first be cleaned off with a pure solvent, like Sika Remover-208, to remove the worst of the soiling
Lightly abrade the contact area with a very fine sanding pad
Remove the dust with a vacuum cleaner
Pretreat the substrate 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-206 G+P or Sika Primer-215, using a clean brush or a felt applicator
Drying time: 30 minutes (min) to 24 hours (max)



Finished Painted Hulls of Aluminium or Steel, Coated with a Two-Part Lacquer


Pretreat the substrate 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)



Timber Rub Rails

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



Moulded PVC or Polyurethane Rub Rails


The bond face of the rub rails must be free from mould release agents or other chemical contaminants. All traces of such substances must be removed before proceeding
Abrade the bond face of the rub rail with coarse sand paper (60/80 grit) to key the surface
Apply a thin continuous coat of Sika Primer-210 using a clean brush or felt applicator
Drying time: 30 minutes (min) to 24 hours (max)



Application of Sikaflex-292 or Sikaflex-291 Adhesive/Sealant

Place the elastic spacers in position (thickness 2 mm, approximately 50 Shore A hardness)
Apply Sikaflex-292 (or Sikaflex-291 if rub rails are to be held using additional mechanical fixings) to the bond area using an appropriate bead
Assemble the components within 20 minutes of applying the adhesive
Press the rub rail into place, either directly onto the face of the hull or fitted over the core profile
Use clamps, etc., to hold the rub rail in position while the adhesive sets. If the rub rail is to be secured with mechanical fixings, any holes should also be filled with adhesive
Clamps and other fastening aids can be removed after 24 hours
Full service strength is attained after approximately 7 days
Uncured Sika adhesives or sealants can be removed with Sika Remover-208


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



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