Painting and Decorating Concourse
Mottling is an overgraining method that adds character and detail to woodgraining projects.
The most common tool for mottling is called a (logically) "mottler" and these tools come in two variations.
The "wavy" mottler is a unique brush that has it's bristles shaped in an "s" design. The standard mottler is made with it's bristles in a straight line. The standard mottler can be converted to a "wavy' mottler by sticking one's fingers into the bristles about mid way causing a bulge or "s" type of shape. The bristles of most mottlers are short and stubby.
Mottling Technique
Apply the graining glaze to the surface. Next you should create highlights of light and darker areas prior to the actual mottling by wiping the glaze off a little bit with the mottler held in a flat, sideways position. By lightly "scraping" the glaze off with the sides of the bristles in a random way you can add variations in color..
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Once you are satisfied with the tonal variation, and while the glaze is still wet, you can proceed with the mottling.
The mottler is pulled in the direction of the woodgrain in a snaking, bouncing motion. You can do the mottling in an "S" pattern of varying sizes. Be sure to vary the mottling so that it doesn't look mechanical. There should be a "rhythmic" quality to the mottles but not an exact repetition along the whole piece of woodgraining.
Once the mottles have been added they should be softened with a softening brush to a greater and lesser degree. Don't overdo the softening or you will obscure the mottles .
Softening brushes come in real badger bristle - which is very expensive or (see the above brushes) a very soft synthetic or natural bristle, made to resemble real badger. For most softening the synthetic version works fine.
Your glaze should be thinned with clear glazing liquid (if using Modern Master's Tintable Glaze) or with clear glaze and a bit of thinner (if using an oil glaze). If you don't thin your glaze you will obscure your primary graining and lose the detail.
Learn more about woodgraining glaze here
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