Dont spray him directly....Mist the sides of the tank, not him directly. Also try not to soak the substrate. A humid hide is a good idea, but some bp's won't bother with it. I offered mine a humid hide for three sheds and kept the overall humidity around 55% and he did not have a very good shed, nor did he use the humid hides.

The mesh on your tank should not rust, unless it is really cheap, but I have never seen that happen. Especially if you take the damp towel off for a few minutes everyday to wash it/replace it with a new one. As soon as you think your bp is going into a shed cycle, you up the humidity to 65-70%.

You can identify a shed cycle by a slight pink belly, dulling in color of the skin, and then the blue eyes. The eyes shoud clear up in a few days, but his body will still look dull. He will shed after that point. I feed my bp right through a shed, but some BP's will not eat because it is difficult for them to see through the dullness of the skin over their eyes.

I hope this helps.