Minor bubbling on rocker

sireland67 said
Stick a magnet on the area, a light refrigerator type, if it does not stick, its already has plastic filler.

What might help is sticking a garden hose in the rocker, and rinsing it out, maybe just full of mud or sand, keeping moisture on the back side.

Then let it dry and then spray some rust converter in there.

Adamm! Great to hear the Eastwood stuff worked as advertised. It SOUNDED perfect for what I was looking for, now tell me whats the best deal I can get buying that stuff? SIRELAND, yes, I want to make sure the rockers are cleaned out- to prevent any gunk from holding moisture and to make sure the rust sealer adheres. Again, this car is garaged year round and will only be out on a limited basis in summer. I was considering cutting a hole on the top of the rocker under the sill plate so I could spray it out before sealing; not sure the openings at the pinch welds on the bottom will be larger enough to spray in or drain any gunk out?