Punctured gas tank 2005 Cadillac CTS

I have a 2005 cadillac cts with 24,000 miles. I recently ran over a curb and damaged the gas tank underneath. There is a small hole that gas was leaking out. The leaking has stopped. I was told that it could be a few thousand dollars to replace the gas tank. The damage is a small slit, the tank still holds gas and does not leak unless completely full. Is there a way to repair by sealing or some sort of sealer or caulking as to avoid huge repair costs? Also is there a danger in driving the car with damage to the gas tank?