In an emergency, is it possible to use the draco and super draco thrusters alone to slow down the vehicle after re-entry? Right from the point parachutes are supposed to be released right upto touch down on water or land. So basically if the parachutes fail(God forbid), are the thrusters capable of slowing down the vehicle after re-entry in Earth to safe touchdown?

Also is there protection for the draco and super draco thrusters from sea water?