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Wooden Surfaces Coatings Systems
Coating performance is, in
general, proportional to the degree of surface preparation. Prior to coating,
wooden surfaces should be clean, dry, free from dirt, wax, grease, and other
foreign matter. In general wooden surfaces require sanding but in
some cases they may also have cracks or holes that need to be filled or sealed.
Another decisive factor for coating successfulness is the
use of correct paint system according to the specific end use requirements.
For interior use, wood requires coating in order to enhance
and preserve the decorative and aesthetic appeal, as well as to improve its
ability to withstand abrasion and wear. Flooring applications require coatings
that are impact and abrasion resistant.
For exterior use, the prime requirement of wood is the
ability to protect the substrate from water and the damaging effects of
ultra-violet light.
CLEANING and SANDING
Prior to coating, wooden surfaces should be clean and dry.
Hot air is used to remove moisture from wood. Sanding is used either manually or
by the use of a power sander with a fine to medium sandpaper to remove all loose
fibrous materials. Sanding residue must be removed prior to coating. Any trace
of oil and grease can be removed from the surface with white spirit. Allow
cleaned surfaces to dry.
OIL TREATMENT Of WOODEN SUBSTRATES
Some kinds of wood
usually present a problem when trying to color or stain. Some apparently random
areas on the surface of the wood absorb more color, leaving dark blotches
"especially when using dark stain" for that reason it is recommended to treat
the wood using Woodtreat prior to staining.
Woodtreat contains special oils to
control stain penetration and additives to
protect wood and inhibit mildew growth on coating surface.
COATING
Two different processes can be used for the protection of
wooden surfaces:
A- DYE & CLEARCOAT SYSTEM (refer
to substrate treatment of wooden surfaces diagram)
- Azmeh Dyes are used for dyeing wood.
- Clear sealers are
used to seal dyed wood.
- Clear lacquers are used to preserve
and enhance the natural beauty or decoration of wood.
B- PIGMENTED SYSTEM (refer to substrate treatment of
wooden surfaces diagram)
- Prime with appropriate primer / surfacer and allow to dry.
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If required, fill all open joints, cracks, holes, etc. with suitable
putty. Allow filler to dry then sand with fine sandpaper.
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Surface with suitable primer / surfacer to provide a smooth and even
surface for coating systems. Allow primer / surfacer to dry prior to
finishing.
- Finish coating with suitable topcoat system.
Different full paint systems are available as is shown in
the substrate treatment of wooden surfaces diagram. The choice of a process for
substrate treatment and coating depends on different factors such as interior or
exterior use, furniture, flooring (parquet) etc…
Substrate
Treatment Of Wooden Surfaces
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