Inside the roof of my Wildcat

I recently had my glass removed, roof repaired and repainted on my '68 Wildcat. I was unable to get the headliner done at the same time and am now ready to send it out to the upholstery guy to get it done. Here's the question: I recently visited a guy that has a '67 Wildcat that looked nice (with an older repaint) and noticed rust above the c pillar near the drip rail coming from behind. I looked at my roof, sans headliner and I can see a light rust coating and tar paper falling off. I want to use some kind of a product That I can spray on before the headliner gets done. Presently, there is no significant rust to speak of, only light brown surfaces that almost wipe off. Something like WD 40 just to act as a rust inhibitor to make sure it never rusts. Any product advice would be helpful.

 

Why not POR? (Paint over rust) Available in clear, silver or black as I recall. Used it in a trunk floorpan before-works great.

 

I used that stuff extensively on my Mercedes resto and it does work great, but I want something thinner that will run into all the crevices at the sides of the roof that I can spray in.

 

Permatex makes an spray can rust converter, works really well

 

Thanks, I'll check it out.

 

Ospho, and a pump spray bottle.

It is an acid, so make sure you cover/drape everything.

Good goggles (might look funny, but swim goggles are best), gloves, and a respirator, because you will be spraying in an enclosed space and dealing with gravity and the mist.

It is water soluble, for clean up.

Spray, let it dry and prime and paint.

 

Yep Ospho is good stuff as well

 

Cool, I'll check them both out, thanks.

 

I'm a big fan of Zero Rust spray paint. I just took a stiff wire brush and brushed all the loose rust up on the underside of the roof, and also laying in the trunk and brush the underside of the qtr panel.
After brushing, I wiped everything down well with prepall, and sprayed over whatever was left. I figure, it took 50 years for it to rust that much with no protection, I'm fairly sure I can seal it all away with the zero rust rattle can.

 

Good to know. I still have to get around to removing the bits if tar paper that managed to survive stuck to the inside of the roof. My second bow above the driver seat is missing a White plastic clip to secure it to the middle of the roof. The rest are all there. Are they vital? the bow seems pretty ridgid without them. here's a pic of what I mean...