If I wanted to paint a white line the length of a ship, such as a Brocklebank, then I would paint the hull white; add a fine length of tape where the white line should be; then spray the hull black.
To prevent any bleed from the black, I would coat the tape with a varnish and let it dry completely before painting the black. When the black has dried, I gently remove the tape and, hopefully, a fine white line is left without any bleed from the top coat.
The same could be done for waterlines etc.
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