Review (4/5): Great for curing whatever!
I must admit, I do not use this conventionally -- rather than curing polish on my nails, I use this to cure UV resin and nail polish on flies (the kind you fish with!)
Most fly-tiers use a UV flashlight to cure one fly at a time, but I can stick several flies in this UV lamp and cut down on time spent. The timer function is especially handy. Based on the lamp's performance on my flies, I wanna say it should work wonders for fingernails.