It depends.
Carl:It depends on the condition of the vinyl. I tried to scrape them off and that did not work. I tried the hair drier and that did not work. I used the eraser and the entire cabin stripe was gone in a matter of minutes. The vinyl on cabin was very dry and brittle.Then I tried to remove the stripes below the toe rail using the eraser. This was not nearly as easy to do but it still worked. I used the eraser on a air drill (using a compressor). The entire port side of the boat probably took about 3 hrs. This vinyl was much thicker and more pliable so it was a much slower process.You can obviously try the scraper and hair drier/heat gun first. This will cost you nothing but your time. It that is NOT satisfactory, try the eraser.You may also want to consider one of the chemical products from 3M or one of the other mfg.Just be careful when using a scraper, my experience was that it did a better job of gouging the gel coat than removing the vinyl.