if all else fails, try to get a paint sample from something on your boat
and go to your favorite paint store and have it specially mixed to match what you have.
Any painter will tell you that you will have different color variations from
batch to batch as well as exposure to the elements in your particular area.
So, taking a sample of what you have for a match should guarantee
a close color representation of what you are touching up.
jus my Dos Centavos