Review (4/5): NO GEL REVIEW
i purchased both the chrome and holographic powders, however i DID NOT use gel nail polish. I know these powders are meant for gel, but i used regular nail polish and the picture polish Revolution glitter base coat and foil top coat.
Starting with the holo, i just could not get the pigment on my nails! i tried it first on my bare nail (with the base coat) and saw the holo tilt, but no actual color. kind of like a holo top coat or something. then i tried it on my nail with regular black polish on the bottom, picture polish revolution on top of that, then the holo powder. unfortunately i got the same result. this way had a few tiny patches where it looked like it would cover the black polish, but for the most part it still just looked like a topcoat.
Now for the chrome. I honestly LOVE the chrome powder. i tried it first on my bare nail with just the base coat, and it made a thin layer of silver chrome, pretty transparent, but it just looked like a sheer shimmer polish. i thought it was really pretty and totally kept it on for about 2 weeks. After that I tried the same black polish with the base coat on top and then powder. The chrome CAME THROUGH. the chrome looks great on top of the black, but i wasnt able to get it to cover my nail completely (had a few patches that were just thinly covered) but i blame that mostly on myself, and not the powder.
overall i 100% recommend the chrome powder. I personally would skip the holographic unless you just want light coverage