Depends on the size of the base. Large ones are more vulnerable to warping than small ones.
Water spills are always a concern, as that involves a lot more water than any other issue.
Humidity will depend heavily on the environment. Unless you have a humidifier running in your painting room, odds are your humidity in an American winter won't be much of a factor. On the other hand, summertime humidity might become an issue.
I've worked with some larger MDF bases and not had any real problems with warping... but they have warped a little bit. Had something gone differently I might have had a serious problem. It might well be worth sealing them just to be safe, especially if you live in a humd part of the country.
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