When adding pigments, dyes and micas to an uncolored base there are a couple of tricks.
First, don't "overload with color". For a single bottle of nail polish, you really don't need more than about a "pea-sized" amount of pigment, dye or mica added. Too much color and your nail polish will not dry correctly and it will tend to peel off.
Secondly, it is always a good idea to "wet" the pigment or dye with rubbing alcohol before adding it to your polish, otherwise you run the risk of the polish being gritty.
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Would you say the luster base needs a longer dry time than other polishes, even the glamour base ? Mine seems to be staying 'goopy' a long time.
Sometimes the problem with the goopy is that the customer has added too much pigment to the product. Try applying it uncolored first, and get a feel for it it seems right to you. You can thin it down a little bit with a clear coat polish. The amount of color to add would be about 1-2 "pea size" per full size bottle of 15ml. Sometimes customer add a lot of color, thinking to make it "one coat cover", but a lot of powder makes the product thicker, and slower to dry.