I have had multiple failure of valve cover gaskets and the breather- (are they covers?) sealant. But not for a while. Was first done under an extended warranty so the event price was $100, then 2nd failure covered under a Mopar warranty and I believe the 3rd repair was the breather covers, another $100. Im handy but not a mechanic. Someone mentioned that after sealant is applied, the engine must not heat up in order for the sealant (or was it valve covers) to set up for at least 24 hours. I have not had a failure for a while so hopefully not again. Have no idea if there is a better gasket or better sealant. There are those on the forum who would have those answers.