" " wisno wood furniture finishing: Liming stone for wood finishing

Monday, August 8, 2011

Liming stone for wood finishing


Liming techniques is a wood finishing process using limestone or liming (calcium carbonate) or Ca CO3. This material is widely used as building materials. The uses of liming stone in the wood finishing have been known since long time ago when the traditional finishing such as: varnish, wax and oil were popular used. Now when the modern finishing material has been available, there are many finishing material can be used to replace the liming effect. The liming stone effect can be imitated by using the glaze or latex paint by some modification. But now in this article we combine the liming with the coating to make special effect finish. The limestone is used to make the wash or antique effect. The white lime stone is used to fill the pores and grains to produce the contrast effect between the wood and the grain. And we use the NC clear coating to give finish protection film.

The finishing process with liming stone


 wire brush
  • Wire brushing.
To produce the contrast effect of limestone we need the wood with open, large and big grains and pores. The oak or mindi are the suitable wood. To enhance and accentuate the wood grain and pores, then we need to open and enlarge the wood grains and pores.  We can brush the surface pores of wood with wire brush to open the wood pores and grains. Brush the wood with the direct along with the wood grain to the entire wood surface and make sure all pores and grain are open.
Make sure all the pores and the fiber are already open and then do scuff sanding on the wood surface to smoother the surface.
  •  Stain application.
The stain application is used to make the wood color more even and equal. Use the sap stain to sap the light wood and equalizer stain to cover the annoying colors. We can also apply a body stain to the entire surface if we want to adjust the wood color. You can get to our previous articles: how to match color in the wood finishing.
  • Wash coat application.
Wash coat is a thin sealer coat. The wash coat is used to coat the stain to give protection to the stain is not erased when the application of limestone. Apply the coating with a wash coat by spray evenly on the surface. Wait until the wash coat dry and then do scuff sanding to smooth the surface.
  • Application of liming paste.
The liming paste is used to fill the wood grains and pores to produce the contrast effect between wood color and the white liming inside the grain and pores. Liming stone is a white powder. In the application the white liming powder should be diluted in the water to make white paste. We also need to add some binder to unify the lime powder. We use latex paint as a binder for the limestone powder. Mix approximately 1 part limestone with 1 part latex paint. The ratio between the lime stone with a latex paint will affect the finishing effect obtained. The more limestone powder the more powder effect will be obtained. The more latex paint while make the more solid the mixture and the more solid the result will be. The type and brand of latex paint will also affect the results of finishing effect obtained. Do some mixing trials until you find the effect you want. You can also add colored latex paint if you want some colored dust effect.
 Brush the
liming powder to the wood surface; make sure it fills in the pores, grain and gap or crevices. Wait until the liming powder is dry, and then wipe and sand the surface by scotchbrite. Clean the liming powder in the surface and leave the liming powder inside the pores and fibers.  Then we can see the contrast effect from the wood color at the outside and the white effects inside the pores and grain. Make some highlight at the white liming powder to enhance the contrast effect.  

lime wash finish panel
  • Application of top coat.
The finishing with the limestone usually is used to make more natural appearance finish. Since that the thick film layer is not suitable. We avoid using sealer, since the sealer tends to produce a thick film layer.
We use a thin top coat to layer the contrast effect resulted by the liming powder. Thin the top coat and spray to the liming finish. Let the top coat dry and feel the surface, if the surface is smooth then finishing process is finish. But if the surface is rough then we need to re coat the finish. Scuff sand the top coat and re spray the top coat and let it dry for several hours. If the surface is still rough, then we can sand the finish with very fine sandpaper (1000 grade). We can also apply paste wax on the finish to get a smooth feel surface.  

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