Talking about the common paint disease and preventive measures of wood coating

White shift

the reason:

· There is a dirty handprint on the substrate or paint film after the sand is stained with water (water sand).

· After the water sand, the substrate or paint film is dry, but there is moisture in the micropores of the substrate.

prevention:

· Ensure that the surface of the substrate or paint film is clean before painting with water sand.

· After water sand, it should be fully dried to remove water.

· Consider using a dry sand process.

·Treatment method: remove the problem paint film, dry and polish and recoat.

2, sand marks

the reason:

· Poor adhesion between layers due to improper ratio and poor flexibility of paint film.

· The recoating interval is too long.

prevention:

· Lacquer in strict accordance with the specified ratio.

· The recoating interval should not be too long (6-12 hours).

· Paint off to the surface of the substrate and re-coat it in strict accordance with the regulations.

3, particles

the reason:

· The painting environment is dirty.

• There are dust and other debris on the surface of the substrate.

· There are impurities in the paint.

• The painting tool is not clean.

· Inferior paint or paint has deteriorated.

prevention:

• Make sure the surrounding environment and the surface of the coated substrate are clean before painting.

· Paint is applied after filtration.

• The painting tool needs to be clean.

• Deteriorated paints are not available.

· Use high quality paint.

4, foaming

the reason:

· Wood moisture content is high.

· The air humidity is too high.

· The bottom layer is not dry.

• The coating is too thick and the solvent is difficult to volatilize.

prevention:

· Pay attention to the moisture content of wood and use it after drying.

• If the humidity is too high, the construction can be suspended.

· The primer layer must be fully dry, otherwise it should not be painted.

• The primary coating does not exceed 30 μm.

5, crack

the reason:

· Wood has a high moisture content, causing shrinkage.

· The film is too thick at one time.

• The undercoat is not sufficiently dried, that is, topcoat.

• Excessive addition of curing agent.

· The properties of the upper and lower coatings are different.

· Old film with cracks is re-coated.

·The bottom ash is less oily, easy to shrink, and insufficiently filled.

prevention:

· Wood moisture content should be dried to more than 10%.

• Appropriate coating amount, a small amount multiple times, and the layers should be sufficiently dry.

• Apply the top layer after drying.

• Add a curing agent in proportion.

· Correct understanding of the matching of the same type of paint, carefully choose.

·Remove the old paint film that has cracked before it can be sprayed.

· Fill enough and leave no cracks.

6, peeling off

the reason:

· High oil content in wood.

· Wood moisture content is high.

• The surface of the substrate is contaminated with wax or oil.

· The front paint film is contaminated.

· The layers are not polished enough.

prevention:

· After the wood is degreased, brush it again;

· Control the moisture content of wood below 10%;

· Remove oil and wax, keep the paint film clean;

· Strengthen the polishing between layers.

7, whitish

the reason:

· The relative humidity of the air exceeds 80%.

· Dilution is not used properly.

· Transparent putty is too thick.

prevention:

· Pay attention to the air humidity at the construction site.

· Try to use the manufacturer's matching material.

·Plastic putty is thinly batched, and it should be polished as much as possible after drying.

8, sag

the reason:

· The viscosity of the coating is low.

· The diluent volatilizes slowly.

· The partial paint film is too thick.

· The surface of the substrate is uneven.

· There are too many paints on the edges and corners.

· The product itself is a problem.

prevention:

• Properly increase the viscosity of the coating.

· Improve the flatness of the substrate.

• Use fast drying thinner.

· Don't paint too thick because of the time.

• Remove excess paint from the corners.

9, bite the bottom

the reason:

· The front coat is not sufficiently dry;

· Improper supporting system;

• The diluent is not used properly.

prevention:

·The front coat is dried before it is finished;

·Use matching bottom paint and matching thinner.

10, shrinkage hole

the reason:

• High oil content in wood or oily or waxy surfaces.

· The substrate is not filled tightly.

• There is oil in the compressed air.

· Inferior paint.

prevention:

· Oily wood should be degreased and sealed.

• Solvent rubbing oil or wax contaminated substrate surface.

· Change the paint and fill the holes tightly.

· Regularly clean the pipeline during spraying and drain the oil.

Concerned about surprises

Tag: Wood moisture content Filling Hole Coating Sand process Water sanding

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