Qijia Classroom: How to Prevent and Solve the Problem of 12 Large Wall Construction Problems

   Nippon Paint (Western Chemicals)  

1, coating wrinkling

Cause: The application of too thick, wet film drying time is not enough, suddenly high temperature accelerated drying.

Prevention: 1 thin coating; 2 appropriate extension of time; 3 to prevent the wet film heating up too quickly.

Solution: Recoat the paint after it has been leveled.

Blistering

Reasons: 1 under direct sunlight or the substrate is hotter; 2 wet when the substrate is wet; 3 moisture escapes from the interior through the external wall; 4 exposed to high humidity environment; 5 short-term drying after the film maintenance within the rain.

Prevention: 1 Confirm that the humidity of the substrate is less than 10%; 2 Confirm the recoating time, according to the time required by the product; 3 In the hot weather in the summer, avoid construction at noon.

Solution: Determine if blisters occur on the substrate, locate and remove the source, scrape blisters, and repaint.

3, cracking, peeling

Reasons: 1 use of inferior paint; 2 excessive dilution or coating too thick; 3 improper surface treatment, such as putty is too thick, loose, poor durability; 4 cracking of the paint film caused by the cracking of the substrate; 5 paint is too hard or due to age Aging becomes brittle.

Prevention: 1 use high-quality paint; 2 multi-layer peeling, use putty.

Solution: Brush off loose materials, sand the surface, sand edges; use as little putty with a certain durability and water resistance.

4, foaming / shrinkage

Reasons: 1 excessive vibration barrel; 2 using two different qualities of paint or coating time is too long; 3 roller coating is too fast; 4 roller hair is too long; 5 coating is repeatedly roller coating or brush back and forth; 6 in the porous The surface roller is coated with light or matte paint.

Prevention: 1 use high-quality paint; 2 keep it for a period of time before brushing, so that the paint eliminates bubbles caused by dilution, stirring and vibration; 3 avoid excessive repetitive roller coating or brushing; 4 use short hair rollers ;5 Use a primer on the porous surface first.

Solution: Recoat after grinding.

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