Jaxs, even more good ideas - I didn't mention series bulbs only because cutting/splicing/wiring tends to make those unfamiliar with electrical practices NERVOUS, and it SHOULD - also, it takes two 100 watt bulbs in series just to get 50 watts from BOTH bulbs TOTAL, so unless whatever you're keeping warm is totally enclosed, I doubt you could keep something like a table saw or jointer warm enough to stay above dewpoint in some cases...
(Just in case my wattage statement above causes someone to wanna argue, here's the basic math - two identical items in SERIES, with a voltage applied to the series string, will cause the resistance ACROSS the string to DOUBLE, resulting in HALF the CURRENT that would flow in a SINGLE device - Identical items will have the same resistance, so each item in the 2-item string will ALSO have half the VOLTAGE...
Wattage - determined by Volts time Amps; so if BOTH Volts AND Amps are HALF (compared to a single device) you then have HALF of a HALF, which = 1/4. Therefore each 100 watt bulb (if that's what's used) will see 1/4 of its rated wattage.
This won't be EXACT, because Tungsten (filament) has a Negative temperature coefficient - if it's not getting as HOT, its resistance won't drop as much in series, so the ACTUAL wattage might end up being a little MORE than 1/4. (Obviously more than some people wanna read, if so just IGNORE this part

)
I was concerned about the incandescent ban too, so I ordered a couple CASES of the 100 watt rough service bulbs a few years ago; my "stash" may outlive ME - but your comments made me curious, since heat lamps are ALSO incandescent (I wouldn't wanna pay for an LED version that actually puts out 250 watts
So I googled "incandescent bulb", and THIS popped up
Was there actually an incandescent light bulb ban?
Apparently the last phase of the "ban" is yet to come in 2020, but meantime you can still buy 100 watt bulbs from several sources, including the one in the link
SATCO - S8518 - 1A19/RS | Regency Lighting for $.42 each (if you hurry)
or from Amazon
https://www.amazon.com/Aero-Tech-ULA-98-100-Watt-Service-Incandescent/dp/B000CEY9P6 for $$2.83 each
Another option for small heat sources might be "plant seedling bed warmers" - similar to some freeze tapes, but built-in T-stat (IIRC) set to around 70 degrees -
https://www.amazon.com/Quick-Electr...41195224&sr=1-27&keywords=seedling+heat+cable
those are a bit more expensive than a light bulb, but could just be wrapped under a machine bed and left on, or multiples thru a power strip - that one only draws 32 watts...
Or similar, but cheaper
Wrap-On Gro-Quick Electric Soil Warming Cable. Thermostatically controlled heat. 6-48 feet
Definitely more than one way to "skin a cat", but it helps to understand some of the CAUSES of things rusting... Steve