Well you should! I'm a long-time model kit builder, and Future floor wax/coating is pretty much the Holy Grail of sealing paint jobs in that hobby. I can't see why we can't use this on our dolls. Here's a great site that explains Future quite a bit.
http://www.swannysmodels.com/TheCompleteFuture.html
What are the pros of using Future on dolls?
*It's acrylic-based, so it is completely safe on resin.
*It doesn't yellow when exposed to direct sunlight, or yellow with age.
*It's designed to protect floors from heavy traffic, so if you use it as a sealer on dolls, your faceups or body blushing is pretty much bullet-proof.
* Easy to clean, since it's acrylic-based.
What are the downside?
* It doesn't come in a spray can, so it can only be applied via brush, or by airbrush.
* It only comes in gloss, so you will still need to use MSC to dull down the gloss.