Car storage

I keep my cabby in a pre fabricated concrete garage with aspestos roof, with all this cold and wet weather I've noticed there's a condensation/dew  on it sometimes, it's not soaking wet but enough to leave marks when you rub your hand on bonnet, is this anything to worry about, I was thinking of getting a indoor breathable cover or blankets etc, any suggestions please,neil.

A mate has a concrete garage he keeps his (classic) Mini in. They are lethal for long term storage, esp in northern England in winter. I'd go as far as saying being parked outside is better as atleast some of the time it will be dry!

You need to get plenty of ventilation, counter intuitively this means have lots of gaps and drafts. It needs to be water tight but not air tight. Mate also has a dehumidifier in car to stop seats going mouldy.

I wouldn't put a cover on it as that would prob just trap more moisture

Thanks for advice,I'll not bother with a sheet then,I've done all sorts to the garage to try and get it right, we have had fog today,went in after work and steam up a lot  😬it's got no electric in there so no dehumidifier,I've read about ventilation so I've bought some 4 inch vents,just need to figure a way to fit them without concrete shattering when drilling,lol