Step-by-step method for scraping putty

Put a small amount of putty on the scraper, the scraper is almost upright, and scrape a thin layer on the polished part to fill the small pits on the workpiece and enhance the adhesion between the putty and the plate, which is also called sheet metal putty.

First scraping ash

The first time scraping ash, the main point is "once in place, fill it in". Before scraping, the workpiece has obvious defects, so the operator should know the defects of the workpiece, where to scrape the ash, where to coat it thickly and where to Bo Tu, and pay full attention to it when scraping the ash for the first time. The so-called "once in place, fill it in" means that the deep place should be thick, the thin place should be thin, the place where the ash is scraped must be scraped, and the transition surface must be smooth without leaving traces.

Second scraping ash

Take some putty with a scraper, the scraper should be slightly lower and the scraping force should not be too great. Fill the parts to be scraped from four different directions. The purpose of the second scraping is to further smooth the surface and make up for all the sand holes and defects scraped in the first scraping.

Third scraping ash

Lower the scraper to scrape off the putty in the filling area or make the middle part slightly higher. Finally, use a scraper to close the knife, so that the periphery of the scraped putty is symmetrical and clean, but the scraped area must be slightly smaller than the maximum extension of the feathered edge. The third scraping is actually the repair of individual parts, commonly known as "light harvesting". "Light harvesting" is to solve the problem of individual sand holes and insufficient local flatness. Small area, thin scraping, attention should be paid not to leave obvious defects.