Well, I just posted about my pleasant table saw tuning experience, so I have to offset that with a bit of a frustration.
Before I tuned the saw, I cleaned the surface of some light rust. I live in CT and this winter has been VERY cold. My shop is in a dedicated bay of a two-car garage, but there's a stud wall separating the two bays (a door gives access between them). The "shop" is about 6 feet wider and deeper than a "typical" garage bay, which puts it at about 16'x24'. The walls are all insulated, but there are two fairly large windows, two sky lights, and the garage door isn't insulated.
I heat the shop with an 80,000 BTU propane heater, which generally does a pretty good job. A few weeks ago when the outside temperature was about 35-40 deg. F, I was able to get the shop from about 40 degrees to about 75 degrees in maybe 20-30 minutes. Today, the shop was at a nice and cool 21.5 degrees F and it took a LOT longer (about 1.5 hours) to get to 70 degrees.
Now to the rust question, the light rust that I found on my table saw wasn't too big a deal. I just sprayed the surface liberally with WD-40 and let it sit for maybe 10 minutes, then used a green scotch brite pad and my ROS to buff it off. Then I sprayed it with some Topcote and a good layer of paste wax.
Last week I had to do the same thing to my jointer (the 6" Delta professional). The only thing different was the amount and severity of the rust. The jointer had some pretty thick rust and it was on just about every cast iron surface on the tool. It took me a LOT of effort to remove it, even though the table saw and jointer had sat idle about the same amount of time.
Tonight, when I started to work on the tablesaw and as the garage/shop heated up (using a 80,000 BTU propane heater), I noticed that the jointer surfaces already had signs of light rust again (pretty faint, but still there, and after only about a week since I cleaned it, and coated it with Topcote (no wax on the jointer)). As the room became warmer, I saw SEVERE condensation on the jointer. It was literally puddling up on the tables. I was mystified. I checked the tablesaw surfaces - no condensation. I checked the bandsaw table - nothing. I even looked at a few of my handplanes, etc. and no sign of condensation - it was just happening on the jointer.
Does this make any sense?? It sure explains why the jointer is suffering the most from rust, but I don't really get why the jointer surfaces would be so much colder than the rest of the tools, which is the only reason condensation would preferentially occur there. Has anyone else experienced this kind of thing?
I read the interesting review of rust removal and preventative agents in the latest Wood magazine and I have some Boeshield on order. I hope it does the trick, because I don't want to have to deal with this every week or two when I need to use the jointer.
Sorry for the long-winded post, but hopefully someone has some insight into this.