Not quite the same thing, but similar to that with the dark spots.
I went to repair what I thought was a bubble of surface rust, about 3/8" in
diameter where the paint was just slightly wrinkled, on my otherwise rust-free
1986 Mustang GT. (This car gets parked for the season before they even THINK
about putting salt down on the roads, and doesn't come back out until after the
soaking spring rains.)
Anyway, I used a spot blaster on the area and got it clean, but it still had
that dark spot. After digging away at this, it turned out to be a half-inch
hole by the time I got to solid metal. And this was on the rear hatch, that
shouldn't rust at all.
So, I would be very wary of those dark spots, whatever the method used for
cleaning.
Craig Reese wrote:
> Wondering if anyone in the group has had experience with soda blasting
> their cars. I recently had my project car completely soda blasted to
> remove the surface rust. The PO had all the paint removed and then let
> it sit outside for who knows how long. There was no serious rust, just
> surface type stuff. Well, the results aren't quite what I was expecting.
> I was expecting a clean, dull metal grey surface. Many parts are like
> that, but there is also some of what looks like the tell tale black of
> deeper rust in many places. Is this appearance normal, and safe to go
> ahead and begin priming?
>
> Craig Reese
> Support Technician
> Spillman Technologies
> creese@spillman.com
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