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nature : Tu in pencil wood outside to increase its beautiful paint. Generally using cellulose nitrate as the main raw material. Divided into primer, topcoat, three types of varnish. Primer was applied directly to wood surface fill its wood grain and grievances, Paint contain more pigment filled. Paint primer was applied, so pencil it needs color. Varnish is the polishing, excluding paint, containing large numbers of low-viscosity nitrocellulose and synthetic resin. Pencil Paint solvent, operational requirements using quick-drying process, most of the low boiling point.
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