I have been filling rocker panels and door pillars and even rusty doors with Big Gap Filler. I clean the areas and blow them out and then paint as much of the surface as I can with that heavy duty extra rusty Rustoleum Primer and then fill them with Big Gap filler. The stuff bonds very tightly to the metal and it can't ever flake off because the stuff expands and holds the material tight to the metal. If I have big gapping holes I make a form with waxpaper and then duct tape over that to keep the stuff from just falling out. I have found that with a little care you can get smooth paintable surface when you pull the wax paper off.
This is cheap and quick and flexible. Lot less work than bondo but more importantly the Gap filler keeps the metal dry and stops future rust.
So my question becomes why don't they just fill rocker panels with gap filler from the factory?
This is cheap and quick and flexible. Lot less work than bondo but more importantly the Gap filler keeps the metal dry and stops future rust.
So my question becomes why don't they just fill rocker panels with gap filler from the factory?