Polishing is more expensive than ordinary spraying. It will cost about 3-4 times. Spray (powder) is generally economical, about 1 square meter RMB 10 ~ 20. With the labor cost of polishing, RM5 ~ 65,438+00 is not expensive. Pretreatment is usually based on the size of the workpiece, antirust requirements, matching environment and economic benefits.

Spraying hardware can be outsourced. Don't worry about environmental protection. Painting is recommended, but pretreatment should be done.

In fact, the requirements for wastewater discharge are not too high. A set of sewage treatment equipment costs 65,438 yuan+0-200,000 yuan. The permit has been arranged. Other monthly expenses are recycling chemicals and treated powder. (dosage determines cost. )

Polishing is similar to spraying, but fine sand is used.

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