RTV silicone sealer is just fine. Remember that it is activated by exposure to air, so apply it to the bolt, then wait 5 minutes before re-installing the bolt.
RTV is an acronym for "Room Temperature Vulcanizing" silicone, meaning it dries at room temperature. RTV is a rubber polymer. Similar to epoxy, it is made of the base rubber material plus a curative that is activated by exposure to air. The best-known use of RTV silicone is as a sealer in home construction. But the properties of this versatile material make it ideal for many applications.