If it's the rubber/steel composite one piece gasket, no sealer at all should be used/required. Just some oil or white grease to let the gasket slide and not bind when it's tightened.
You might try this - get the car up on jackstands and drain the oil (clean pan - you can reuse it). Loosen all the bolts. One at a time remove the bolts (with small socket and a small wrench I can get to all of mine without jacking the engine) and coat the threads with thread sealer. Once you have thread sealer on them all, gently retorque the pan - starting from the middle and working your way out criss-crossing from end to end. Then clean everything really well and try again.
You might try this - get the car up on jackstands and drain the oil (clean pan - you can reuse it). Loosen all the bolts. One at a time remove the bolts (with small socket and a small wrench I can get to all of mine without jacking the engine) and coat the threads with thread sealer. Once you have thread sealer on them all, gently retorque the pan - starting from the middle and working your way out criss-crossing from end to end. Then clean everything really well and try again.