i have a 1970 chevelle that iam trying to get ready for paint , my question is how do you stop rust from coming out of body or fender seams. panels are all soild but it looks like every seam and even around the door hinges are leaching out rust, also the area between the rear glass and trunk deck is solid but when i look from in side the trunk i can see rust between the upper and lower panel, HELP PLEASE

When they built our velles they paid little or no attention to corrosion protection. Mostly all untreated metals,they were sprayed and not dipped after bodies were welded together. Many interior areas and pinch weld locations had NO protection. Three things must be present for rust, metal (ferrous material) air, and moisture. Once all accessable areas have been cleaned and protected, options are limited. Other than a very runny rustproofing product there is little that can be done for pinch weld areas, other than keeping dry. On some of the boxed in areas, use of por-15 or similar product, loaded into area through access holes may help. Also rustproofing product may slow things down. One of the challenges when doing frame off, and acid dipping is how to get to the closed in areas to protect. There are some dipping methods that do not use acids, which are hard to neutralize after dip. When doing body on resto we are stuck with the areas we can get to, other than my previous comments. If there are any better ideas out there I think we would ALL benefit. Karl