I use two bed sheets and still get condensation. WD40 useless. Keep meaning to get something like ACF50
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i think you have grounds to bring it inside like potted plants to protect from frost (or at least that what i would tell the other half)
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Saying that though, am beginning to wonder which is looking most like a workshop now. Workshop or flat. 
I've found the best solution to keeping the rust at bay is to use it regular And keep it covered in oily swarf.![]()
My surface grinder disagrees but ground surfaces do like to rust
