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Block Sanding Filler
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Different Blocks for different jobs
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You will always want to chose your block in accordance with the dent your repairing. Longer blocks tend to keep your work straighter & when your doing a larger repair on a straight panel & long board file will likely be your best choice. Typically smaller blocks for smaller jobs is a safe bet. You also want to be mindful of your panel in terms of keeping the scratches to a minimum, this will be beneficial to you when it comes time to paint. The smaller you can keep your repair and surrounding scratches, the more room you will have to blend your color on the panel.
Blocking
Try to maintain a medium pressure on your block, enough to keep it flat but not to much to force sanding. Let your block do the blocking and your fingers do the walking. For beginners it takes time to really get a feel for how straight your repair is, it is recommended you use a guide coat over your filler to help you spot out the high & low spots in your repair. Guide coats are covered a bit further in the primer block sanding section.
Sand Paper Recommendations
Your initial cuts should be with a coarser paper such as 80 grit. You should gradually switch down to a 120, then a final sand with 180 grit. If your filler does not feel straight after sanding, reapply your filler and sand again. On larger dents you can expect anywhere from 3-5 applications of filler. As you become more experienced you will achieve a straighter job in fewer applications. If you finish your body filler off with too coarse of a sandpaper, your primer may sink after the repair is completed and scratches will become visible in your repair area.
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