I use Air Seal too.
Much better and easier to work with than silicone sealer.
its available from Racers Choice RC Products
not sure if they have a website but they are is Austin, Texas
Pm me for a phone number.
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0