Keep in mind that the stripe is vinyl and it is very likely that whats on your boat has faded. I doubt a patch would match. :roll: sorry
I'd just do the whole thing, the end result will be like new.
All wax and chalky film has to be removed.
One of my least favorite but most repeated sayings is "one project always creates another".
Incidentally I've the same project planned for this winters layup.
I use a Cyclo polisher,
http://cyclotoolmakers.com/Model_5.php
It will not harm paint or fiberglass gelcoat unless your really trying hard to mess up.
I use 3M Finesse-it Glaze. Marine or regular doesn't matter they are the same and will work very well for auto paint or gelcoat.
Take measurements and pics before you peal the tape off. Use a heat gun to gently warm the glue and the tape will come off.
After buffing to a shine use 3M blue painters tape to hang the stripes before you peal it from the backing to line it up as a trial fit. Then you can lay down blue tape as guides for the real thing. When you do hang the stripe use a very little Dreft baby detergent mixed with water in a spray bottle. Spray it onto the hull and you can gently float the stripe into place. Then gently squeegee the water out. Give it at least few days to set up before waxing the hull.
If you don't want to go that route and still want to patch it you can use a straight edge and a razor to trim and from a few feet back it may work.
You'll notice that the factory overlapped the stripes a little, you can copy them and do it that way too.
I laid the stripes in place on my Charger in the way described above. I wouldn't kid you, there was plenty of anxiety getting it done but it really wasn't hard.
Floating it into place really helps.
Not great pics of the stripes but enough to get the idea.
Where are you located? Anywhere in NJ?
Mike.