What is crevice corrosion on a car?
Rust coming out of a seam, sill, wheel arch or door bottom has usually been going for years, from the inside. These are places where two pieces of metal are folded or welded together. They trap water and salt in a gap that never dries. What you can see is where it finally came through.
What kind of repair does it need?
Cutting out the rusty metal and welding in new. You cannot treat rust that is coming from behind a panel. On sills and arches this is metal work, and paint is the smallest part of the bill. A small arch repair and a structural sill repair are very different jobs.
Metal work, not paint work. Ask whether they will cut out and weld or just fill. Filler over rust like this comes back.
What to do next
Get it checked soon, and have the underside checked too. Check the same spot on the other side of the car. Ask if they will cut out and weld or just fill, and whether it affects anything structural. Filler over rust like this comes back. If the repair gets close to what the car is worth, get the number so you can decide.
Sources
- Aluminum Associationindustry association
Crevices (narrow openings) at mating surfaces can collect…
- PPG GBpaint maker
Strip the paint from the affected area down to the bare metal, remove all existing corrosion…
- GarageWeldingblog
Body filler does not replace missing metal.
Not sure what your car damage is?
Point your phone at it, or describe it. The answer in seconds, $8 AUD.
Check it