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Bumper Scuff Repair, Part 3

Posted by Jay Schneider. Filed under Automotive.
November 2, 2009

After the primer has thoroughly cured, start sanding the finish with 220 grit sand paper or the equivalent. Sand the area using strokes on a bias – this prevents creating a flat spot on a curved surface. (See Figure 1)

 

Sanding on a bias

(FIGURE 1)

Follow the 220 with 320 grit sand paper. Be careful as to not sand through the primer. Blasting through the primer will require re-priming.

When satisfied with the work accomplished, it is time to lay down the basecoat. Thoroughly mix the basecoat making sure any solids that have accumulated on the bottom of the can have been dissolved and mixed into the paint. This particularly holds true if spraying a metallic basecoat. Wipe area down with a final cleaning solvent made for cleaning prior to painting. Very important - this specially formulated solvent flashes off readily preventing the solvent from attacking or softening the surface. Using a solvent not made for final cleaning will attack the finish creating many headaches for you!!!

Tack the area with a tack cloth just prior to spraying the basecoat. Figure 2.  

Tacking the Basecoat

FIGURE 2

This will minimize the any dust from accumulating. Carefully follow the paint manufacturer’s Technical Data Sheets for application instructions. Start spraying the basecoat by applying one light tack coat. Let basecoat flash off, and re-tack cloth the surface. Apply the second coat of basecoat by applying a medium coat of paint using a pattern called East to West. This means left to right or right to left. Let basecoat flash off – re-tack the surface and spray the final basecoat with a North to South pattern. Using an East to West and North to South spray pattern will assure minimal paint striping and or light paint conditions by giving a full or consistent pattern. See Figure 3.

 

Applying the basecoat

(FIGURE 3)

 Continue applying the basecoat until a uniform color is obtained. The key here is to avoid applying too much paint. Apply just enough to provide a uniform color and coverage.

Next Up? Clearcoating.

 

Scott S. Mc Lain

Vice President

Sales & New Product Development

 

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