Hi Tony I would not blast your roof, they warp up pretty quick from the heat and hammering from the sand blasting
To do the roof lay a plastic sheet down and fill will water and molasses or caustic soda and cook off the rust .It does a much better job but takes a little longer
Phil you are lucky to be able to get your floor bolts from Fastenal , here in Canada we have to order them from the good old US of A , even the other bolt suppliers bring them in from the US
Cheers boys keep up the good work!
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