80% of the products currently on the market are water-based, meaning that they can dissolve in water and diluted with water. We will start from water-based undercoat. The explanation, however, is doomed to be lengthy. When talking about undercoat, we should always start from the three attributes of the undercoat, namely, water-based, oil-based or alcohol-based. When using, it will surely bring in some risks once skip the tradition ways.
It is because that, after all, the new characters are not known to everyone. Although most undercoat products currently on the market guarantee three-in-one or even five-in-one, saying that they can function well as a foundation on all kinds of media, it is still necessary for us to get started from traditional processes. To be more detailed, we need to further distinguish the area requiring paint, is it a ceiling, a wall, a doorframe or a window? Is the doorframe made of wood or iron? When differentiated more detailed, it is required that different media should use different undercoat. Generally, whenever it comes to finish coat, undercoat will be mentioned. Official explanations from many websites and journals suggest that undercoat lies at the bottom of finish coat, functioning as a foundation, closing wall spaces (substrate), and increasing the adhesion of the finish coat. Undercoat, just as its name implies, is a layer of paint on the surface before finish coat.
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