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Firewall Smoothing Guide - Smoothin' & Fillin'

How To Semi-Smooth A Firewall On An A-Body Chevrolet

By Mike Harrington, Photography by Mike Harrington
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    The firewall (from the factory) is filled with high and low spots. We employed a hammer and dolly to flatten them out as much as possible without stretching the metal.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    The firewall (from the factory) is filled with high and low spots. We employed a hammer an
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Once again, the grinder is put to work grinding down the tack welds on the firewall.
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Despite our best efforts with the welder and hammer and dolly, some areas will still be impossible to get to because of the double steel wall and vent passages. Most of the effort put into the firewall is going to be in the visible areas. Our efforts would be wasted in placed that are going to be covered by the inner and outer fenders or areas where the bellhousing is.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    Despite our best efforts with the welder and hammer and dolly, some areas will still be im
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Evercoat Extreme body filler was used to level off all the low spots on the firewall and cowl vent panel. After the filler set up, we sanded a great deal of it back off. We left just enough to smooth it all out.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    Evercoat Extreme body filler was used to level off all the low spots on the firewall and c
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Areas where we could use a DA sander sped things up nicely. The rest of the sanding was good old-fashioned, elbow grease. We used 80-grit paper with both the sander and manually.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    Areas where we could use a DA sander sped things up nicely. The rest of the sanding was go
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Once all the sanding was done, the vehicle was rolled into the paint booth, and the firewall and, of course, the rest of the bare metal was shot in etching primer.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    Once all the sanding was done, the vehicle was rolled into the paint booth, and the firewa
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    About 20 minutes after the etching primer dried, the high-fill PCL poly primer is sprayed over the entire vehicle. This primer is perfect for filling up to 80-grit sanding scratches.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    About 20 minutes after the etching primer dried, the high-fill PCL poly primer is sprayed
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Two days later, after the primer had finished drying and "out gassing," the fun part of the job began. This is otherwise known as wet sanding. The reason for wet sanding is to level off the primer surface. A level primer surface without any type of texture will help the paint and clear lay flat with very little texture.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    Two days later, after the primer had finished drying and "out gassing," the fun part of th
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    While the car is being dried off outside, inside the paint booth the PPG DBC Copper Head pearl basecoat is being mixed at a 1:1 ratio. This color was a one-year-only application on the '05 Dodge Viper. The copper color should look great on this Monte Carlo. The PPG was purchased at El Monte Paint in Rancho Cucamonga, Calif.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    While the car is being dried off outside, inside the paint booth the PPG DBC Copper Head p
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Three coats of PPG Copper Head were spayed onto the firewall.
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    Here is the final shot of the semi-smoothed firewall. Imagine it with the inner and outer fenders, A/C delete panel, master cylinder and booster, windshield wiper motor, etc.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    Here is the final shot of the semi-smoothed firewall. Imagine it with the inner and outer
  • 1971 Chevy Monte Carlo Firewall Smoothing Guide
    A few days of work adds a subtle touch to the underhood look of any vehicle. As for the rest of the story on this Monte Carlo, we will have the paint and body article on the Super Chevy website (www.superchevy.com) once it has been block-sanded.
    1971 Chevy Monte Carlo Firewall Smoothing Guide
    A few days of work adds a subtle touch to the underhood look of any vehicle. As for the re
SOURCES
El Monte Auto Paint Harrison Restorations
By Mike Harrington
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