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I've been using the 3M stuff for years. I have no problem with seepage, as long as I rub it down really good, and remember I'm sticking it to glossy paper to print my graphic, peeling it off that, and sticking it to glass to cut it, then peeling it off that, and resticking to the car. Even after all that I rarely get seepage. Just gotta rub it down really good with the back of my finger nail. Also, you should lay a couple light mister coats, before you lay heavier coats. That helps seal the edge of the tape. You don't want tape that sticks too good, because it might pull paint off with it.
But, despite my endorsement, regular paper masking tape of any brand or type is less that ideal for these cars, because it's too thick, and will leave the edges raised up. I lightly sand to help level it. Also because it doen't stretch very well, and has a tendency to wrinkle on contours. I use multiple pieces to avoid the wrinkling.
Ideally you want some masking film from your LHS, or towerhobbies.com. It is a very thin and flexible plastic, making it easier to work with, and giving you nicer crisp clean edges.
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