Full scraping skill of automobile painting

The skills of painting and scraping the car are as follows:

1, the first grinding must be done horizontally with the coarsest sandpaper, and more water should be used. Then, if there is a small pit, fill it with putty and polish it with coarse sandpaper. Until the whole surface is flat, there is only a sandpaper path. Then scrape the putty, this time the putty must be very thin, and then polish it with suitable sandpaper.

2. Before using putty, it needs to be stirred evenly in proportion. Put less curing agent, putty will dry slowly, put more curing agent and dry slowly.

Selection principle of putty construction

There are many kinds of putty with different functions, and the matching requirements of coatings make the selection of putty more important. The matching problem of putty with primer and topcoat is essentially the matching problem of polarity. The greater the polarity of a substance, the greater the molecular binding force. Conversely, the smaller the polarity of the material, the smaller the molecular binding force.

Among them, polar synthetic resin coatings (such as amino and epoxy primer, putty, topcoat, etc. ) is larger, while oily coatings (such as grease glue, phenolic primer, putty, topcoat, etc.) are more polar. ) is small, and there is a kind of paint (such as alkyd primer, putty, topcoat, etc. ) Whose fault is it between the first two?