Sikaflex 291 is Polyurethane based Marine Adhesive Sealant, it is suitable for Marine Boat Construction.

Sikaflex® 291 is a multi-purpose product for use in marine construction. It is suitable for making elastic, vibration-resistant joint seals, and can also be used for the adhesive bonding of teak deck and for a variety of interior and exterior sealing applications. Sikaflex® 291 bonds extremely well to the materials commonly used in marine construction such as pleasure yachts, passenger liners, fishing boats to tankers, and canoes to offshore oil rigs. It is also suitable substrates include wood, metals, metal primers and paint coatings (two-part systems), ceramic materials and plastics (GRP, etc.).

 

	Sikaflex® 291 is a one-component, low viscous, medium modulus, polyurethane-based sealing/adhesive compound. This all-purpose grade is used for general sealing applications. Sikaflex® 291, Black, White or Grey.
	Sikaflex® 291 is a Professional grade Marine Adhesive/Sealant used by boat builders and yards to bond and bed boat components structurally. Fast strength build-up overnight. Use above and below the waterline. Comes with nozzle.
	Sikaflex® 291. Among its many applications are bedding deck fittings, sealing plumbing and sanitary equipment sealing joints including keel/hull, stern shaft tube, bonding deck to hull etc. It is also excellent for bonding anti-slip man-made decking materials. It can be sanded and painted and its fast curing time and exceptional adhesion properties make it particularly suitable to a wide variety of repair jobs as well as boatbuilding uses.

Surface Preparation
Sikaflex 291 polyurethane Sealant

Correct surface preparation is the key to successful bonding. In many instances all that is required, with the Sikaflex Marine Product Line, is a simple cleaning operation, but where there are weak or contaminated surfaces, more extensive preparation is needed to ensure a perfect bond. Typical problem areas include dust, dirt, grease, fat, oil, rust, flaking paint, etc. The actual pretreatment selected will depend on the type of substrate (metal, plastic, paint, wood, etc.), the operating conditions in service, the degree of surface deterioration and the practicalities of any particular installation.

Method of application:

Surface preparation. The faces of the joint must be clean, dry and free from all traces of grease, oil, wax and dust. The adhesion of the sealant can be improved by wiping the joint with Sika® Cleaner (cleaning and activating agent) and applying the appropriate Sika® Primer.

Application. Pierce the cartridge membrane and peel back completely. Place the unipac in the application gun and snip off the closure clip. Cut off the tip of the nozzle to suit joint width and gun the sealant into the joint with a suitable hand operated or skeleton/compressed-air gun, taking care to avoid air entrapment. Once opened, packs should be used up within a few days. Do not apply at temperatures below 10°C or above 35°C. The optimum temperature for substrate and sealant is between 15°C and 25°C.

Tooling and finishing. Tooling and finishing must be carried out within the tack-free time of the sealant. We recommend the use of Sika®-Tooling Agent N. Other finishing agents or lubricants must be tested for suitability / compatibility.

Over painting. Sikaflex® 291 can be over painted when tack-free. The paint must be tested for compatibility by carrying out preliminary trials. Baked enamels should not be applied to Sikaflex® 291 until the sealant has attained full cure. It should be understood that the hardness and film thickness of the paint may impair the elasticity of the sealant and lead to cracking.

Removal. Uncured Sikaflex® 291 may be removed from tools and equipment with Sika® Remover 208. Once cured, the material can only be removed mechanically. Hands and exposed skin should be washed immediately using a suitable industrial hand cleanser and water. Do not use solvents!

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In Summary:

 

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