Metal building condensation

What can I do in the RIGHT NOW that's cheap or NO COST to help with condensation with my metal building? I am going to end up losing some valuable parts and engines due to rust. I have a 24 x 28 x 12 metal building on a concrete slab. I have not had problems like this except in the past few recent years. I need to know what I can do NOW to help combat it, or I may as well just cart it all off to the scrap yard.

Rusty, they make a bubble wrap looking insulation that has like a R15 or R20 rating. We put it in a 20 by 32 x 16 building, stopped the condensation and kept the temperature constant. Right now, it's 67 degrees in there and it's only 48 outside, with no heat running. It cost us around 250 to do.