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Discolouration and spillage in damaged areas

How do I correct colour variation caused by a wet paint film being disturbed before fully drying?

When pigments have been disturbed in this way, wait until the paint is completely dry. Then reapply paint avoiding touching the wet film.

How do I remove any spillages?

Care should be taken to avoid spillages on to glass, cement, brickwork, carpets, clothing etc.

If spilled, solvent-borne coatings should be removed immediately while wet using white spirit.

Water-borne coatings should be removed using a warm detergent solution. Once dry, the coatings will be very difficult to remove without damage to the surface.

I have used Cetol Novatech on exterior cladding, but there is a brown stain under every nail?

Because of the vapour permeable nature of Sikkens woodstains, iron or steel nails are not "sealed off" from air and moisture, thus rusting of the nails can still occur.

Rainfall then washes the rust away and is seen as a brown "tear-like" discolouration of the timber. Any loose or rusty nails, screws, etc. should be replaced with galvanised or non-ferrous fixings, which will not corrode, even if exposed to the weather.

Wherever possible it is preferable to use lost head nails, but if this is impractical, nails should be punched home and any remaining holes filled with a suitable woodfiller.

What causes salt staining on plywood and how can I get rid of it?

Salt staining can appear on low grade wood-stained exterior plywood, especially on eaves and soffits. Salts are contained in the adhesive used to bond the layers of plywood together. Because wood stains are very permeable, they can bring these salts to the surface of the wood. Rainwater will normally remove these salty deposits, except in sheltered areas such as soffits and eaves. The only way to remove these deposits is to wash them down until they no longer appear. To prevent this when fitting new soffits adequate ventilation is required and coating the back of the board.