I had leaks also then I used teflon tape and no prob. The reason NOS says not to is because if you get teflon in the valve it might not close all the way :( but I took extra caution and stoped all leaks :). Also you never want to leave your bottle on when not in use. I use the remote NOS valve on the bottle and hooked it to my arming switch so after arming I also open the bottle a little plurge and good to go.