Actually though Jo has a silicone based lube, they're H20 version that she's talking about is silicone safe. I work as a sex toy store, not only do we recommend it for silicone toys, but a love them come with a packet of it for a free trial.
You could use J-Lube. http://www.ebay.com/itm/like/360476546325?lpid=82 Its a powder you mix yourself. Allergy-free, silicone safe, and you mix it with water. I've got a bottle and I've had it for three years...I don't have a tail...but I do have silicone sex toys and it's never damaged any of them. You'd only need a little bit to ease a tail on, its so slippery.
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