I use Solarez Thin-Hard 2 oz for Streamer flies which could be used over lures too.
I would not recommend thick as it is way too thick.
Thin-Hard is the same viscosity as 30 wt. motor , easy to apply,
it is self leveling so I rotate the fly by hand when applying UV .
I then set the streamers outside in the sun to remove tackiness.
The final finish is Crystal clear, very hard and not tacky.
Tip: If you buy it in a bottle I recommend getting a syringe cap-applicator. When ordering It is listed at the bottom of the page.
http://solarez.com/products/syringe-cap-applicator/