Well first off you gotta make sure that the surfaces are clean, flat and in good shape.
Secondly what water neck are you using?
Third I have had luck with just the gasket or just rtv but never both at the same time.
Make sure you let it cure the correct time.
2016 VW GTI 2.0 Turbo
1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph