Generally, there are three kinds of white, orange and green covers. The properties of the three kinds are different, and there is no good difference between the model tools, depending on the production needs. The white cover has strong adhesion and is used for bonding parts. The green cover is a highly mobile glue with strong fluidity, which is suitable for bonding or seamless production of small parts. The orange cover is a common model glue, which is more corrosive than the green cover, but has poor fluidity. The so-called fluidity, in layman's terms, is that the concentration is different. The degree of corrosion is the degree of corrosion of this glue to parts, and the white cover is the largest, so the adhesion of parts is high. The corrosion of orange cover is moderate, and the green cover is second to the orange cover.