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TR6 corrosion prevention

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crash21

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I plan to sandblast the tub and frame of my 72 TR6.
My question is about the order of things.
I have some work to do on the b pillars.
Would it be better to take the body off the frame and do the sandblasting to reveal any other potential problems or should i fix the problems I can see, then remove the body and do the sandblasting?
Also I am reading a lot about rust prevention..POR 15, Eastwood etc.
They are supposed to be applied to bare metal. Once I sandblast the car , it will flash rust quickly so it has to be put under primer while I make my repairs but these products say not to use them over primer?
Thanks for any insight and advice.
 
Crash, I would do my repairs before taking it off the frame. If not then you will have to do a lot of bracing to keep things lined up, if you take it off first. The POR 15 is a good product and lots of firms sale a 2 part primer that will seal everything. Be sure and ware a good respirator, their fumes are bad news.

Wayne
 
For myself I have chosen to sandblast the bare frame and used Por15 . Then places that I needed to repair/ weld I cleaned off the Por15 to get to bare metal to weld to. Then go back and treat any bare spots as the repairs are complete. Living in California we don't experience the flash rusting problems that you do.
Charley
 
You will quickly find that blasting the metal reveals weak areas you never dreamed were bad before the blasting. The beauty of blasting is that it provides the perfect surface for any decent primer to adhere to. "Decent", in my definition is any 2 part primer, i.e. epoxy. The POR is good for old-school, but remember that it is old school, and the newer primers are, well, better. Unfortunately, 2 part primers cost like liquid gold, so applying and then removing them to do the repairs would get expensive.

If surface rust is an issue because of the humidity where you are, I'd recommend blasting the area you want to work on, repair it, and then prime it. Move on to the next area and do the same. Of course, if you plan to do all the work in short order, like within a month, I'd live with the surface rust for that length of time. Modern primers will bond right to it, especially with the rough blasting surface underneath.
 
Having just finished this job this summer, It's still fresh in my mind. I sand blasted local areas as I did the repairs. By the time I got to the last repair area several months later, the first ones had surface rust. I then blasted the entire tub (which did uncover a few additional bad areas that had to be repaired) and applied a two-part epoxy primer. There are a lot of pictures here: https://bullfire.net/TR6/TR6-49/TR6-49.html

Montage.jpg
 
Wow...so.many responses and great advice and tips... Thanks everyone!
I believe my plan of action will be to blast the spots that obviously need work before I remove the body.
Once those repairs are done I will brace and separate the body from the frame and blast the rest of it and see what other issues I may have. At this point in time the only major issues I have seen is the back of the b pillars. I certainly may find more but that is what is obvious at the moment.
I will go with an epoxy primer.
Thanks again for all the responses.
 
You could choose soda blasting and do it all at once. The residue, if kept out of weather, will impede rust for months. Wash with dish detergent when done, prime with epoxe, and paint.
Bob
 
You may want to wipe with phosphoric acid as that works well post soda blasting, but best thing is to get a sealing primer on it asap.

I maybe in the minority but I'm not keen on POR15 having used it. Epoxy primer over clean/treated metal is now I do it now...
 
I've never used POR 15 or any of the other products mentioned. I'm trying to figure out the order of things and the best way to do this to prevent any of these problems for as long as possible.
Thanks for all the info and suggestions.
 
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