Skim Coat Plaster
Skim coat plaster, also known as wall putty (Chinese: 膩子灰/批牆灰), is a pre-mixed dry powder mortar that only requires water to be added and mixed before use, eliminating the need for on-site mixing. It is made from materials such as gypsum and cement through industrial production and does not contain organic components, making it less prone to mold growth and offering better moisture and water resistance. Skim coat plaster has a harder and finer texture than traditional lime putty, resulting in a smoother surface, but it also requires more labor for application. There are different types of skim coat plasters available on the market, like “Wall Putty Treasure” suitable for repairing small defects, and “Crack Repair” for filling larger cracks.
Sealer
Sealer (Chinese: 司拿/水施拿) is a type of water-based primer that is usually applied to the wall before plastering or painting. Its main function is to fill in the small pores of the wall surface, forming a waterproof barrier layer to prevent moisture from affecting the paint. Compared to varnish, sealers have less chemical odor during application.
Lacquer
Lacquer (Chinese: 力架/光油) is an oil-based moisture-proof primer, primarily made of synthetic resin, with good waterproofing and breathability. After applying lacquer, it can seal the fine pores of the wall, preventing air and moisture penetration, and providing a solid base for the paint layer. Compared to water-based primers, lacquer has stronger waterproofing capabilities and better penetration, but it has a stronger odor and takes longer to dry. When using lacquer as a base, it is important to ensure ventilation to avoid prolonged exposure to paint fumes, which can affect health.
In summary, skim coat plaster, sealer, and lacquer are commonly used materials in modern renovation projects, each playing a different but interconnected role, and are more reliable and professional than traditional materials. The choice of which one to use depends on the site environment, budget, and environmental protection requirements. I hope the above explanation is helpful to you.