I drilled two holes on the gas tank in the trunk by mistakes when intalling the stereo amplifier without realizing there is gas tank behind it. It was too late when two holes were already drilled. Is there special good sealant product out there that can seal off the holes completely even the gas vapor can not escape.
It will be very costly to have the weld shop weld off the holes. Please let me know if there is good products and where can I buy them.

Thank you