Small Leak in Spa Air Line

[jmce1587]

My PB had a leak detection company inspect our raised Spa and they have determined that their is a small leak in an air line that services one of the jets. Short of breaking out the plaster/gunite to get to this leak is anyone aware of a product on the market that can be circulated thru the system to seal a small leak, I guess similar to what one would use on a radiator?

thanks

Jmce1587