What is the final grit in the sanding sequence for a plastic bumper area repaired with a flexible bumper repair kit?

What is the final grit in the sanding sequence for a plastic bumper area repaired with a flexible bumper repair kit?

• A. 80 grit
• B. 180 grit
• C. 280 grit
• D. 400 grit

Answer: (C)

In finishing a plastic bumper repair, you want a surface that’s smooth to the touch but still has enough texture for primer to bite into. Sanding steps go from shaping and leveling with rough grits to refining with finer grits, ending with a finish that feathers the repaired area into the surrounding plastic without leaving deep scratches or losing too much material. For a flexible bumper repair, the final sanding step is a mid-range grit. It provides the right balance: it smooths the repaired patch and blends the edge into the surrounding bumper, while still leaving a light tooth for primer adhesion. This final step is commonly done with a grit in the 200s range, with 280 grit being a typical choice. Grits that are too coarse would leave noticeable scratches, and grits that are too fine could hinder primer adhesion by removing the necessary texture. Earlier steps would be coarser (to shape and level the repair), and later steps would be even finer as you approach priming.

In finishing a plastic bumper repair, you want a surface that’s smooth to the touch but still has enough texture for primer to bite into. Sanding steps go from shaping and leveling with rough grits to refining with finer grits, ending with a finish that feathers the repaired area into the surrounding plastic without leaving deep scratches or losing too much material.

For a flexible bumper repair, the final sanding step is a mid-range grit. It provides the right balance: it smooths the repaired patch and blends the edge into the surrounding bumper, while still leaving a light tooth for primer adhesion. This final step is commonly done with a grit in the 200s range, with 280 grit being a typical choice. Grits that are too coarse would leave noticeable scratches, and grits that are too fine could hinder primer adhesion by removing the necessary texture. Earlier steps would be coarser (to shape and level the repair), and later steps would be even finer as you approach priming.