Inner fender rust removal

[NHRoadrunner]

I've looked around and found various threads about opinions on removing inner fender rust. Outside is no problem to sand, but the inside is contoured and has bracing so it may be more difficult.

What is everyone doing nowadays to remove surface rust from the inside of the front fenders? Goal is to get them down to bare metal to prime and paint. I've read horror stories about evapo rust gel so that's out.

 

[PurpleBeeper]

I use a “rust converter” called Rust Mort that you can buy at part stores. It turns rust into iron phosphate (black). Let it cure about 48 hrs, then prime over it

 

[Belvedere408]

I second the SEM brand rustmort. I get it at the local paint shop but can get off summitracing also.

 

[Coelacanth]

I've read on here that Corroseal is good, works pretty much the same way. I bought a big jug of it based on the positive reviews but have yet to use it...sure to pop it open in the spring though.

 

[Super-Abeille]

I would blast and epoxy the inners.

 

[NHRoadrunner]

I've read on here that Corroseal is good, works pretty much the same way. I bought a big jug of it based on the positive reviews but have yet to use it...sure to pop it open in the spring though.

Yeah I've used coroseal before on truck frames. I'll have to try that, for some reason I thought it coated the rust instead of remove it though

 

[NHRoadrunner]

I would blast and epoxy the inners.

That would be best in my opinion but I've read about warping sheet metal?

 

[493 Mike]

That would be best in my opinion but I've read about warping sheet metal?

A good operator knows how to get around warpage issues.
Mike

 

[eldubb440]

I blast inner fenders and firewalls without issue, there are enough curves and contours to hold it in place...... if these areas do actually warp a little, I have never noticed

if the car is together, you need to mask it up tight; once you got your ducks in a row, it's pretty fast and simple

 

[Super-Abeille]

That would be best in my opinion but I've read about warping sheet metal?

I wouldn't worry about warping the aprons. There's lots of rigidity there. If you were doing exterior panels, that is a different story.