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The one I used for keeping welding rod dry and for glue storage, I kept a 40w or a oven bulb in it.
I remember putting a 75w in it one time. It was 200 degrees in there........Lol
Steve
Mo.
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WaterlooMark 02/9/2020
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Not much. You just want to keep it from freezing; even a 15 watt bulb will put out a fair amount of heat. The paint also has a fair amount of thermal mass, so it will store energy and emit it back out if the ambient temperature inside the box drops below the temperature of the paint.
Based on your post, the box will be kept outside. My hunch, which is not scientific, is that a 15 watt bulb would suffice for heat source in an insulated box like a refrigerator in an area where the average low temperature is above the freezing mark. I wouldn't go any bigger than a 40 watt bulb. Keep a small thermometer inside the box and check it in the mornings as we head deeper into the winter season. Increase the wattage on the bulb if needed.
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Get something like this thermostat with a probe you can install inside the fridge to regulate the temp. Just drill a hole for the probe to install it, then seal the hole.
Then I would use a 40 watt appliance bulb on a dimmer. If you dim the bulb even 50%, the bulb will last a long long time. (Dimmer connects after the thermostat).
https://www.amazon.com/Zilla-11939-Tempe...3&sr=8-111
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Leftover paints that have been opened should be closed up tightly, stored in a cool, dry place and used within two years.
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To heat such a small area, it doesn't take much. I'd bet a 15 watt bulb will get overly warm in there. You might not even need it to be burning except on the very coldest days.
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I have used a 15 watt for paint and glue. Fridge was in an unheated shop at the time. This was before I retired and would only heat the shop on weekends. 30 miles north of Green Bay so some brutal cold at times. !5 kept it plenty warm. Do not use an energy efficient though, they give off much less heat which is good for everything I can think of except this use.