centerline front runners

I recently bought a pair of small bolt centerline front runners and one leaks air out from the center hub area where the two center parts come together with the tires mounted. Rims have no damage to indicate abuse and run true. I noticed that there was a heavy bead of sealant (silicone?) down in the groove where these two pieces come together in the tire area. Can I dig the old sealant out and reseal with silicone? or a special sealant? Does Centerline Inc. offer a repair service? Any others out there who have successfully dealt with this other than by using inner tube? All opinions appreciated.