Strip off the waterbased paint
Strip off old finish
could be tough job, but it is needed when we want to update our old finishing
with a new looked and color. The product must be clean and free from the old
finish as an unfinished surface if we want to apply new finishing process (with
new finishing process and material). We already post an article about strip off
the old finish at our previous article: How to strip off the old finish. In this article we want to
share about how to strip off the waterbase finishing layer at the wood
finishing. Waterbased finishing material includes the waterbased stain,
waterbase coating, waterbased paint, latex paint or wall paint are quite much
used in the furniture industry. They are can be used or in combination in the
wood furniture finishing. The full waterbased finishing system is used to make the
safe and environmentally friendly finishing system. While the waterbased paint,
latex paint or wall paint also much used in combination with solvent base
coating to make some special finish.
Although waterbased
material uses water as solvent, but when it is dry it will cured, hard and
won’t be resolved with water anymore. We need a proper solvent to solve and
break the paint layer. More over the waterbased paint is usually thick and
hard; it has to be completely wetted to get removed easily.
Here is the process of
strip of the waterbased finishing layer
Dampen rag (or sponge)
with washing thinner and put them at the coating surface, let the thinner soak
and wet the finishing layer. It needs some minutes to let the thinner to wet,
penetrate and break the finishing layer. The thinner used has to be the made of
the solvents with high solvability to the paint. Acetone or MEK are the good
solvents to be used, they are strong to solve the paint or coating. But they
both have fast evaporation rate that could be too fast for the striping process.
We can add toluene, and (or) alcohol to
the thinner mix to let it slowly dry.
The wet finishing layer
will be broken, contracted and chipped off. Use a knife to scrape a layer
finishing that is already damaged. Do the scrapping carefully since it may
cause the scratch to the wood surface. Use the plastic knife to minimize the
risk of scratching. Continue the surface cleaning with dampened rag; a scotch
brite also can be used to rub the rest of the paint. Although it has been detached from the wood
surface, the waterbased film layer will not perfectly be dissolved. The waterbased
coating particles may be left inside in the pores and grain of wood. We can use
wire brush to clean the particles inside the wood pores and grains.
If there was wood stain
at the finishing, then there may be some color at the wood. The stain is absorbed
and will change color of the wood and cannot be cleaned with thinner. We can go
ahead to apply the new finishing process at this condition as long as the new
finishing color can be made based at the wood color. But if the new finishing color is lighter the wood
color now, then we have to re sand the wood surface. Use the # 180 sandpaper to
sand the wood surface evenly. Make sure we got the smooth and even wood surface
before start to do the refinishing process.
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