Automobile Putty Formula?
3 Answers
Automobile putty formula consists of: 70-75% double fly powder, 20-25% gypsum powder, 2-2.5% carboxymethyl cellulose powder, 2-2.5% retarder, and 0.4-0.6% thickener. Mix double fly powder, gypsum powder, carboxymethyl cellulose powder, retarder, and thickener evenly to form the finished product. Below is an introduction to automobile putty: 1. Function: Automobile putty is used in automobile painting on the first or second primer after sanding to fill small defects, pits, scratches, or other processing marks, forming a smooth surface for applying the next coat of paint. 2. Characteristics: It features high pigment and filler content, thick paste consistency that dries easily, becomes hard and fine after drying, and is easy to sand. Commonly used types include water-based and oil-based.
I remember when using body filler for auto body repairs, the formula is primarily based on a mixture of polyester resin and talcum powder. The typical ratio is 30% resin to 70% powder, with a bit of hardener added to accelerate curing—mixing requires careful stirring like making a cake to avoid air bubbles. I've also tried adding aluminum powder to enhance toughness, which helps better fill dents. However, be aware that homemade mixtures may lack precision, leading to cracks or peeling, so now I just use commercial pre-mixed products to save time. Actually, different vehicle body materials like sheet metal and plastic require different fillers—plastic parts shouldn't be too hard. Additionally, the curing process releases fumes, so I always wear a mask and ensure proper ventilation in the garage for safety. This material is the foundation for sanding; only after smoothing it out can you spray paint for a flawless finish. Beginners should practice on small repair areas first and avoid rushing.
As a DIY enthusiast who frequently works in my home garage, I've developed some expertise in putty formulations: The main components are resin, filler, and catalyst. For resin, epoxy-based types can be used, accounting for about half of the total volume, with the other half consisting of fine powders like talcum to enhance viscosity. When mixing the catalyst, you need to work quickly—complete the operation within 5 minutes, otherwise it will dry and harden, making it difficult to handle. I've personally experimented with adding glass fiber fragments to prevent cracking, which works well but requires wearing thick gloves during cleanup. In practice, you might encounter issues like uneven mixing leading to surface irregularities, which then require re-sanding. I recommend starting with pre-packaged products and only attempting custom formulations after gaining familiarity. Storage is also crucial—I always seal excess putty and store it in a cool, dark place to prevent premature deterioration, as it hardens upon exposure to air.
