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Silica is a desacant and will obsorb moisture, but it only obsorbs so much. Luckily, it will also give it back up to dryer air. however, the air can't take it at cold temps, so they will only do so much.
As was stated in another thread somewhere, the issue is not so much the moisture in the air but the fact it condenses out on the surfaces, like your engine, or tank, or your tools because the environment they are in is warmer, they hold that warm air inside the box, then the temp slowly drops inside the box due to heat transfer through the box, to the dropping air temps. But moisture does not transfer through, so you get high moisture and low temps which equal condensation. My tools live in my craftsman tool boxes in my unconditioned garage. They dont seal at all, so free air movement in and out. Been there for alot of years, not a one of them has rust on em. However, on a particularly warm winter day in December, I opened the garage door when it had been about 30degrees cooler in my garage than outside, water was running off the bike, and my tool boxes. No rust yet on them though. Just my two cents.
As was stated in another thread somewhere, the issue is not so much the moisture in the air but the fact it condenses out on the surfaces, like your engine, or tank, or your tools because the environment they are in is warmer, they hold that warm air inside the box, then the temp slowly drops inside the box due to heat transfer through the box, to the dropping air temps. But moisture does not transfer through, so you get high moisture and low temps which equal condensation. My tools live in my craftsman tool boxes in my unconditioned garage. They dont seal at all, so free air movement in and out. Been there for alot of years, not a one of them has rust on em. However, on a particularly warm winter day in December, I opened the garage door when it had been about 30degrees cooler in my garage than outside, water was running off the bike, and my tool boxes. No rust yet on them though. Just my two cents.
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