Hi,
I'm having a lot of troubles with humidity and rust in my garage since I have some cutter sets and other fairly expensive electronics tools that suffer the same issues: after 1 month they starts rusting... No matter what it is, what materials are involved or what: they literally start pitting and then they starts rusting.
Considering:
1. at night my parents want the car inside the garage, so it's always parked there and the temperature rise is noticeable even without a thermometer
2. the humidity is terrible, in rainy days there's little difference between inside and outside, and in summer you can't even stay there for too long: you can fell unconscious in that environment, and not because of the heat
3. there's a ventilation window, facing a garden (and bugs love coming during summer), always opened because I have a fume extractor (and there's no way to do a hole on the glass nor in the near wall) first, and second I need to have that window opened otherwise there's not enough air circulation.
4. I solved the concrete dust problem by making a tiled floor and by treating the walls with proper chemicals. I've also treated any kind of wood furniture with a sealing agent, and it works very effectively.
I really don't know what to do in order to fight this issue... I don't even know if the problem is humidity related or what's going on... any suggestion?