1974 Duster - First Mopar

I used the rust convertor that advance auto sells. I used it on my 37 Dodge on the cowl and cowl vent, dash and back of dash, and a few other places. I let it sit 24 hours or so, then run a fine sandpaper over it, primered and painted the car with a base coat, clear coat, never had another problem with rust in those areas.