I used 3M tape, too, and left one application of it in place for one coat of two-part epoxy primer and two coats of marine topside paint, and another in place for 6 coats of varnish, and it worked fine.  The first coat of paint/varnish seals the edge pretty effectively.  I do suggest observing pretty much the minimum allowable time between coats, though, tape is easier to remove if it hasn't been in place too long.

How long should I let the Brightside cure before I put tape on it?  I usually give household paint 2-3 weeks before I go near it with masking tape.  But this FineLine tape is a different animal, and so is the paint.

I used green masking tape on Brightside after 24 hours with no problem. My plywood hull is painted and the strip deck is varnished. I left the tape on the deck through three coats of enamel and on the hull through three coats of varnish. Then I covered the seam with 1/4" black vinyl tape made for boat use, which really looks sharp. -Wes

why don't you paint the black on last it would cover in one coat most likely

lift the tape off while wet and lifting will not be a problem

dont drop the tape