Waterline stripe,paint or vinyl?

[bigeasy1]

I used vinyl to put the waterline stripe on my Tsunami,and it looked great.
That is until I was at the dock and noticed and saw twenty feet of it hanging in the water.
I ordered this stuff from a place that specializes in vinyl striping,and I've done other boats before with no issues.I did notice that ut didn't feel all that sticky when I went to apply it.

I'm wondering if I should paint it instead.I painted the boat with a two part urethane made by Epifanes which is roughly the same formula as Imron.

I'd really rather use vinyl as It would be less prep work,but would paint it if I had too.
Anyone know a good source for vinyl that actually sticks good.
I have a friend in the sign business who may be able to help,but I don't need anything wide,which is what he mostly deals with.