I've used both the bead sealer and the silicone & both work well-IMO- bead sealer seems to last longer though (in my experience on new tires) when doing stuff like donuts continuously where I'd have to re-treat the silicone. When I used the bead sealer I didn't over fill the tire and let it set un-loaded overnight for the best result.The bead sealer doesn't really dry up like silicone and keeps the bead tears pliable. I use slime in all my tires regardless if new or old- it just keeps on working!! I doubt slime would do much on the outside since it's water soluble and would just wash away with just a small amount of condensation. I've only had 1 flat tire in the past 4 years while out driving(sidewall slash)- but many overnight flats that aired right back up without going flat again. Now of course the real cure is beadlocks!!! A beadlock don't care if there's small damage to the outside of the bead.
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