I am working on a 1963 MG Midget and have blasted the body treated with picklex but can not get into the rockers and some boxed frame structure. I considered getting some Zero rust in those areas pluging any holes and giving it a few spins on the rotisserie then drain out the excess. Am I on the right track or is there a better way to treat areas that can not be properly preped?
with my 61 i sprayed rust inhibitor into it as far as possible, and when i undercoat it i am planning on shooting the undercoat inside of it as well.
what product did you use for the rust inhibitor?
i used crest honeycoat if i remember right
I would use the cavity wax rust inhibitor from Automotive International known as "Value Guard" http://www.autoint.com/.
Here is a direct link to the product, PT # VG-RP-20 ...
ValuGard and Daimler Chrysler's Master Shield Rust Inhibitor meet or exceed the Australian Standard Test Method - ASTM-B-117 @ 672 hours accelerated test for corrosion resistance and protection.
My GM dealer applied Value Guard cavity wax and a black wax based undercoating to my 1991 Chevy K1500 truck when it was brand new and it has only very minor rust issues at 16 years. From a distance, it still basically looks like a new truck. It's not perfect, and needs a little work in a few spots, like behind the doors, but theres nothing serious. Your supposed to reapply the undercoating every 7 years, but I never kept up with it like I should have. I also drove this truck through some fairly deep water and was kind of tough on it over the years, so I'm surprised the cavity wax stay on as well as it did.
Some rust proofing products can probably hurt more than help, but in my experience, the valuguard products help.
The aerosol does not have the application pressure of the professional gun that dealers use, but it still does a decent job. Automotive international will also be offering an aerosol version of it's black wax based undercoating soon (I think May of 07).
As I understand it, Valuguard used to be Waxoyl back in 1991 but they severed ties with them in 1992 and improved and updated the formulas.
Hope this helps.
One more note, they don't recommend using black undercoating inside of door panels or any other panel or interior surface , undercoating is for exterior surfaces, whereas the "cavity wax" rust inhibitor is for inside of door panels, fenders, and interior surfaces.
Generally, if undercoating is used inside of doors or panels, the undercoating will just clog up your drain holes and cause further rust, but the cavity wax is designed not to do that.