Tamiya tape works best for me. For large masking jobs I might use a combination of blue painter's tape with the Tamiya tape reserved for the edges only as it's expensive when compared with the blue.

As far as Future creating a secondary border... I personally have not experienced that. It goes on very thinly, almost as thin as water. Unless I am not understanding what uromomo means. Many modelers have used Future over the years to prevent paint bleed with great success. Perhaps the key is not to get carried away with it. Too much might cause a buildup along the edge which may be what urumomo is referring to.