> Of course - hence my request for a product that simply dissolves the
> rust away, rather than one that converts it to an inert compound. If
> you have to sand away the rough blue-black stuff that results from the
> application of these sorts of treatments, you might just as well do the
> job properly in the first place, and sand away the rust back to bare
> metal.
There is an important (to me) distinction though, the converter will
penetrate into the pits and convert the rust at the bottom. Thus you don't
have to remove as much metal to wind up with a rust-free surface.
The pits are frequently microscopic at the bottom, they (and the rust in
them) are usually still there even after you've ground down to "bare" metal.
It's easy to tell, because if the surface is truly free of rust, the
converter won't turn black.
Of course, the penetration has a limit, so you start by removing as much
rust as possible, and overall it's probably more work. But you wind up with
more of the original metal, and the result seems to last substantially
better.
POR-15 is probably better than the converters, but it sounds like even more
work (and a lot of mess) to me.
Randall
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