reply to post by mrmonsoon
The interiors (and exteriors as far as that's concerned,) are concrete, which is a porous surface.
If you want to really clean an irregular surface, prepare a surface from all previous coatings, remove all loose material even at the ten micron
level, the you dry ice blast the surface.
It's quick, it's very thorough, it doesn't introduce anything into the waste stream, it doesn't wet the surface, and it's very cost effective.
Thusly cleaned, this concrete surface would be prepared for a sealer, a nano-crystal titanium dioxide (which we also do), or an epoxy or paint.
It's just odd that hundreds of these concrete bunkers were to be done in such a manner, at such a cost, when many military installations are being
closed down.
Plus, their "story" made no sense.

