Body fillers are an essential part of any car restoration or repair job. They can be used to repair dents, fill in rust spots, and fill in gaps between body panels. There are different types of body fillers available, and it's important to know how to use them correctly so that you can get the best results.

Before you begin, you'll want to make sure that the area is clean and free of dirt, grease, and rust. You can use a wire brush to remove any rust and then sand the area with a coarse grit sandpaper. This will help create a smooth surface for the filler to adhere to. Once the area is prepped, you can apply the body filler. 

Most of the best body filler products come in a two-part formula. The base and hardener must be mixed together in the correct ratio and then applied to the surface. It's important to use a putty knife to spread the filler evenly over the area. You'll also want to make sure that the filler is pressed firmly into the surface. Once the filler has been applied, you can use a sanding block to smooth it out and level it with the surrounding surface.

Once the body filler has been sanded, you'll need to apply primer to the area. This will help protect the filler from the elements and keep it looking good. Finally, you can paint the area to match the rest of the car.

Body fillers can be used to repair minor dents and rust spots on your car. However, it's important to know how to use these products correctly in order to get the best results. By following these steps, you can make sure that your car looks its best and that it's safe to drive.