It will depend on the sparkle.
Do you want the “I just dumped a pound of glitter on my guitar” or a smooth deep silver flake.
For the latter you can do it yourself with a bit of practice.
All you’ll need is a refinish spray gun, compressor, some clear and these.
http://www.paintwithpearl.com/flakes/silver/silver.htmhttp://www.paintwithpearl.com/Pearls/si ... rystal.htmThe crystal adds more sparkle has a nice visual effect.
Clear is easy, Advanced Auto has quarts of Duplicolor clear acrylic lacquer, and clear coat.
It dries in 5-15 minutes (weather/temp) so you don’t need days between coats.
Patience and layers of light coats give the best results.
I found that cutting 50% with acetone resulted in the most even finish.
Also measuring, for best clean up and no waste, I use a $1.00 store turkey baster and injector to measure out the lacquer and acetone. I only mix enough for the gun or airbrush container.
Also using a craft stick (popsicle stick) just a bit of the pigment, ¼” or so, mixes enough an airbrush and 3 or 4 for a detail gun gives a nice finish. . More gives a deeper, denser finish.
Of course you could add a little holographic silver coat just for fun.
http://www.paintwithpearl.com/flakes/si ... erholo.htmThese work (show up) best over a black base coat.
Have fun
MM