Review (1/5): Flakey.
The first package had a broken green and broken blue in it. The replacement arrived in good condition.
The colours are decently bright if you have the patience to do a few layers. Very liquidy... Drippy even. Once dry it is mostly waterproof. Sadly, once dry, it tends to flake off (even a single layer).
Another nit-picky thing is this stuff has a smell like craft paint.