As I recall, the Moroso sealer is a bit more involved than "dump and forget."
You must drain, flush, repeat, fill with water and the sealant, circulate,
then drain, flush, repeat 24 hours later. Last is to fill with proper coolant.
After buying Moroso, I decided to bite the bullet and have my head gaskets
replaced tomorrow.
You are welcome to my bottle of the stuff at half what I paid (was @$15).
Kevin