Here is a tip on avoiding paint overspray inside the Cowl Panel. After you have removed, repaired, and repainted your 1965-1968 Mustang cowl panel, you are ready to reinstall it. Here’s a neat tip for avoiding any paint overspray in the cowl panel area. Use aluminum foil! The aluminum foil catches all the paint overspray that would accumulate in the vent area of the Mustang cowl.
Here’s what to do: prior to permanently welding the cowl lid on your Mustang, line the cowl floor with aluminum foil. Then, weld your cowl lid to your Mustang. When you are ready to paint your Mustang, this aluminum foil will prevent any overspray build-up to the inside of the cowl panel area.
After your vehicle has been painted, simply reach up inside the air or heat intake holes, grab the foil, and pull it out. This leaves a nice cowl interior without the ugly paint “scale” (paint buildup) that is commonly left in the cowl panel area.
Here’s an additional benefit of using aluminum foil: If the aluminum foil is carefully placed, it will also prevent weld sparks or blobs of hot metal from burning the painted cowl panel during the welding process. Aluminum foil works much better than any plastic or paper masking material.