I'm betting on something closer to "slime" the stuff they put in tubeless mountain bikes. Or at least I don't know why the thing isn't built with an inner self

I'm betting on something closer to "slime" the stuff they put in tubeless mountain bikes. Or at least I don't know why the thing isn't built with an inner self sealant. If nothing else if its made with a bit of florescent die locating leaks becomes as simple as looking for the glowing spot on the outside.