Leaky cam cover '90 80

[Al]

A few months ago I put a new Fel-Pro gasket on the cover. I have had leaks before so I checked the cover for being flat, looked ok. This time I used some Permatex  #2 Form.a.Gasket Sealant on the head then placed the gasket on top.  Now I’ve got a leak again on the intake side – rear. 
Does anyone have a magic bullet to really apply a gasket, properly. Guess I didn’t learn that trick in 55 years of tinkering.
The gasket is a Fel-Pro cork type. 

Thanks, I hope all of you guys and gals have a safe Winter.

Al