I've used Tremclad Clear Spray on a few lures and jigs.......it is durable and lasts but eventually it will scratch up just like any other finish.......but beware:- if it is a home hand-painted spoon or plug etc, the Tremclad can make the paint finish "bleed" in some cases.
I also use Krylon Triple-Thick Clear Glaze Spray......this stuff is pretty good and dries way faster than Tremclad.
It is not water-based.
The longer you leave it, the more it hardens up....just like Tremclad or any other paint.
The Krylon really produces a nice shine on spoons or if you are spraying it over prism tape it will make the tape reflect light very well. Makes the light rays "pop".
Sally Hansen "Hard As Nails' clear nailpolish is one of the better clear nailpolishes out there..but even so, it does not last all that long
and I would only use it as a temporary "quick fix'.........It won't last that long as a finish on a spoon.
UV Blast Finish Coat is clear with U/V in it. It is a brush-on finish. While it may add some U/V to tackle it does not last too long and will start to peel off after awhile. Good for a onetime/one-use application...but you'll be redoing
the item soon after that.
I've tried Spar Varnish........but this has a slightly yellowy-browny tinge to it and if you paint over straight chrome or nickel it will change the color slightly, although it seems to be pretty durable.
When you first spray the Krylon on, it will look "misty".....but it will dry to crystal clear.
Doesn't mess up the action on spoons or plugs at all as far as I've seen.