redbouy

The whole boats hull Im on is metalic grey, so i see how hard it is to get a match

First up make sure the under coat is the same color,
Then dust on the silver,
If you applie to much it will go dark. if this happens stop let it dry for a day or so, sand it back and dust again.
2 runs at the most let it dry for a few hours dust again.
The finish should be a bit rough not shiny at all.
remove the tape and then paint the whole thing with clear.
It is all most impossible to get the egdes right of the silver or any metalic paint, so as above its best to do the whole thing.
Doing a small section tape up the area and give yourself a foot or so allaround the area to start and stop on.
Pete