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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