how to fix leak on front manifold on 98 lincoln town car

I have many lincoln the 4.6 is made of a plastic composive it muct be sanded a little and then cleanded with brake fluid, and then use a epoxey the kind some plumers use that has to be mixed , I have done this ,but would not drive a long time check it all the time , also I repaced them with The Dorman Soultion manifold not a baf job the new one will have a aliminum front water jacket housing