I've had trouble with the blue stuff not being sticky enough. I like the $$ 3M green stuff. If you're using a base/clear you shouldn't have too bad of a break line because you don't need as much color as you would with enamel or urethane. The clear does most of the work. Are you striping between the two colors or are you leaving the break line exposed?

Keith
If it were easy they'd have grade schoolers doing it!