Take pre-designed or self-made stencils and remove the parts to be painted using a precision cutter or a hook.
Cut out the outline of the pattern and redo the cut on transfer paper, leaving a wider space.
Then, place the transfer paper on your stencil and scrape well so that they merge. Lift the transparent part.
Position the latter on your hull in the desired location, scrape and remove the transfer diagonally, not forgetting any part of the pattern. Dry with a hair dryer.