When the wood appears with severe mildew but does not lighten when tested with bleach, indicates they have undergone Darkening. This kind of darkening and decaying of wood generally has a solid and consistent appearance.
• Exposure to UV (Ultraviolet radiation).
• Darkening occurs in wood never coated with protective coating (e.g. primer, paint or stain).
|Do not expose new woods to weathering for longer periods of time.|
|Occurs under Clear varnishes and Lightly pigmented stains||To achieve best paint and stain performance, coat the new surface before installation or immediately after installation.|
|Darkening happens in Different degrees on Different woods.||Sand the wood to get a fresh surface, prior to priming the entire wood surface that has been allowed to weather.|
|Moisture Penetration in to the Wood causes varnish coatings to peel off due to wood decomposition under the coating.||Discard the wood that cannot be sanded to fresh wood.|
|Woods Exposed to Weather are not protected against wood-destroying organisms. Such exposed wood decays eventually and cannot be coated.||
• Allow the surface to dry completely, before coating.
• Apply coatings to treated wood after the moisture content has dropped to a paintable level- usually 15℃ or below.
• Splash water on the surface to determine, if it is waterproof.
• If the water gets absorbed and surface becomes noticeably darker, the surface is not waterproof.
• This test is especially recommended for pressure-treated wood and smooth cedar.
• Ensure proper penetration of coating.