Ordered Ospho online last Sunday and it was delivered on Wednesday. Applied it to the rusty spots the other day with a brush. Not sure how I feel about the results. In some spots it worked like a charm after about 24 hours (surfaces turned black), in others it still looks rusty as all get out. I think I may not have put enough on some spots.
So yesterday I used a spray bottle to reapply it to the spots where it hadn't seemed to have penetrated, looking better today, although the white gunk that has formed over some of it is somewhat intimidating. Hoping it dries and turns to powder as advertised.
Pictures are after the first coat of Ospho.
There are a few very small holes in the floor, mostly around the entrance. I'm thinking of just using caulk and some small sheet metal squares to seal them up. The metal still looks pretty solid.
Pictures are here: http://imgur.com/a/AkYcP/all