Hi Tangler.
I respectfully disagree with. I find 3m original blue is inexpensive not cheap. I tried frog twice but went back to 3m blue. If I need crisp lines I will burnish the edge with the bowl of a metal teaspoon. Watch it cause it will get hot. I don't do teak that's the wife's thing. I'm generally painting with awlgrip and that stuff will bleed UP under tape against gravity. But I admit I haven't tried fine line.
YMMV