What is the method for applying auto body filler?
2 Answers
The method for applying auto body filler is: 1. Fill larger dents using a wider, rigid spreader, focusing on leveling rather than achieving a smooth finish; 2. Primarily fill low-lying areas with a thinner application than the first step, using a rigid spreader for flat surfaces and a rubber spreader for curved areas; 3. Fill pores left from the previous two steps, sandpaper marks, and minor dents. Auto body filler is a viscous substance composed mainly of extender pigments, drying agents, and solvents. It is applied to surfaces already coated with primer to fill defects such as dents, weld seams, and scratches on car bodies and components. Through successive layers of application and sanding, a flat and smooth surface is eventually formed.
I just did some auto body filler repair, and honestly, the method isn't difficult. Cleaning the car body is the first step—you need to sand off rust and grease from the dented area with sandpaper, then wipe it clean with water. Next, use masking tape to protect the surrounding areas to avoid smudges. Mixing the filler powder and hardener is crucial; follow the ratio on the packaging (usually 100:2) and blend evenly. When applying, use a plastic spreader to smooth it in one direction—a thin layer is enough, as too much will dry slowly and may bubble. Then wait for it to set (faster in summer, slower in winter). Be patient when sanding: start with coarse 80-grit sandpaper for rough sanding, then switch to fine 320-grit for a smooth finish. Before painting, wipe off any dust to avoid affecting the result. I recommend buying a basic filler kit—don't cheap out. Beginners often rush the process; practice a few times to get the rhythm right.
