I have heard that the 7018s will absorb moisture within a couple hours after opening them from a sealed tin, and must be dried in a rod oven after that. I have also heard not to buy them in plastic boxes, they will already be ruined.

I have an unopened box of 7018s that I haven't tried yet, for this reason. Is there truth to this? If so, can they be dried in a regular oven?

My intended use is for some beginner projects like a steel table, gates, and maybe sides for my flatbed trailer.