My experience with the Scotchguard protector stuff is it makes the fabric feel permanently sticky, kind of a waxy texture. But I find "sticky" to be particularly repellant, so it's possible I'm just overly sensitive to that sort of thing. The slipcover we bought a long time ago came "pre-sprayed," and I had to wash it a half a dozen times before I could comfortably use it. Unless it's a guarantee that Thor will spill stuff on it, I wouldn't bother.
The anti-static sprays are fine in my experience, but they're more of a temporary relief kind of thing. A humidifier in the room might help more.
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