I have a Cowboy 227R that I cover with a large plastic bag type container when not in use. I have slit the back of this bag to allow the thread to hang as usual. Recently I was told this was bad for the machine due to moisture. I keep the machine regularly oiled (every time I use it) but with all the other dust created in my shop, i.e. sanding leather, polishing metal, etc., I am more concerned with the dust. I have a dehumidifier as my shop is in my basement.
Anyway, is there anything to this, should I create cloth cover for it or just leave it out there.