Auto body filler aka Bondo, polyester body filler, plastic filler, mud, etc. is used to fill small imperfections for auto body repair. A few common problems when using #bondo is over grinding the metal on thin metals which thins and weakens the metal. Another problem is, well making a mess by getting it in cracks, gaps, holes, and places you don't need body filler. This takes a lot of time during the shading process to sand and clean the filler out of those areas. This video is going to address these common problems and provide you a few more tips to help you apply and block sand more efficiently and get better results.