Bruce, my gut instinct would be to tear it down to a bare frame. However, realizing what you are doing and IF the blasting guy can truly clean all the undercarriage "real good" then I would go against my own logic and say repair the bad places a piece at a time...and I think some apoxies are as strong as the material themselves.
(I don't tear off the entire roof, or rip up the entire house floor to replace one or two boards)

This is just "my" opinion but seeing the problems tearing it all apart would create for you, and not necessarily be any better, I think I'd repair what you need to and keep going.

The question I'd ask myself is this a bandaid that I will regret later and possibly have to correct anyway.


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
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1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile