How to scrape car putty step tips
How the coating performance of the putty is mainly manifested in filling the surface defects of the coated part and improving the appearance quality of the coating, and at the same time, the putty should have good scratchability.
In order to fill the surface defects of the product, multiple scrape coatings must be used, and after the first putty is dried and polished, it should be scraped in order, and it should not be too thick in the end.
Putty should be matched with the coating according to the needs of the product. Putty is divided into the first and second putty, and they have strict matching with paint. 的性能与涂装材质的关系和各层涂料的特点是非常重要的，这也是正确选择不同性能的腻子，适应涂层要求和与涂料配套的一个重要方面。 It is very important to grasp the relationship between the performance of various in the putty and the coating material and the characteristics of each layer of paint. This is also an important aspect of correctly choosing putty with different properties, adapting to the coating requirements and supporting the coating.
。 Putty must have good binding power with each layer of coating, which is the main of putty coating work.Putty should also have the ability to seal and sand the surface defects of the product. Good sealing of product surface defects is convenient for scratch coating without curling.
During grinding, both dry grinding and wet grinding (water grinding) can be performed. After grinding, it can form a uniform, smooth and flat surface, and has good adhesion to the bottom coating and the top coating. The coating method of the putty is mainly scraping, and the smoothness and firmness of the putty is on the one hand the coating performance of the putty itself and on the other hand the coating operation technology.
The method of scrape coating is correct, can obtain smooth and flat coating, no burrs, no defects of uneven filling, and no uneven thickness or putty residue. Squeegee coating technology should be explored and honed continuously in actual production practice. The coating method of putty can be summarized as follows.
1) Blend putty.
When opening the closed putty bucket, first check whether the surface of the putty is crusted and remove it if necessary. （同类涂料稀释剂或200号溶剂 ）进行稀释。 If the thickness of the putty is too thick, it should be diluted with a matching (similar paint thinner or No. 200 solvent ) after removal.If the putty is too thick, it is difficult to flatten when it is applied, it is easy to be too thick and burr, and it is difficult to smooth it after drying; if it is too thin, it cannot cover the defects. Consistency is good to use. Before construction, stir the putty used thoroughly on the putty board.
刻刀。 2) Scrape coating on the surface of the coated part that has been coated with 1 or 2 layers of primer and dried and flattened. Flat and small flat parts can use a putty knife, horn squeegee blade or cutter.During operation, putty should be less dipped on the side of the blade of the putty knife, and the blade surface should be 60 ° -80 ° with the scraped surface. The thickness of the putty should not exceed 0.5mm in one stroke, and it cannot be repeated for many times to prevent the oil in the putty from overflowing. Requires a certain thickness of putty layer to scrape multiple putties. After the first coat is dry and sanded, the second and third coats must be scraped, and each of them must be dried and ground, and finally polished thoroughly. smooth.
3) During the scraping process, it is absolutely not allowed to add gypsum powder, talcum powder, etc. to the finished putty or the prepared homemade putty to prevent the putty from cracking, falling off, foaming, etc. after drying.
4) Use hard rubber for scraping putty on the surface of complex-shaped coatings. Before scraping, grind one end of the scraper into a slope of about 20 ° ~ 30 °. The slope needs to be thinned. During operation, the thumb and middle finger should be pressed firmly on both sides of the rubber scraper. Do not apply too much force, and scrape several times along the wet and wet surface. You can dry it a little at a time before proceeding to the next step.
5) It is best to treat the surface of metal, wood, etc. to be flat and clean before scraping, otherwise it is difficult to make the putty smooth and smooth, and the surface defects are not filled well.
6) Putty must be matched with the coating used. Generally, the finished product putty will indicate which coatings can be used with this putty in the product's manual. For example, C07-5 alkyd putty can be used together with alkyd primer, nitrate paint, amino paint, and perchloroethylene paint.
Due to the poor adhesion of the coating film on the surface of the coated object or the undercoating layer, scraping the coating film with nails or metal will cause the phenomenon of coating film peeling, which is called peeling. Car paint is easy to peel off ...