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Geleration, Gelish, GelLak ... all the same ... they are coloured gels so it really does not matter which of the hundreds of different makes you choose from in that category ... they all require prep of the natural nail which is precisely why many natural nail clients do not want to wear coloured gels and prefer Shellac (which is not a coloured gel and requires no preparation of the natural nail other than to remove any cuticle build up and then cleanse the nail .. absolutley no buffing).
Shellac in my opinion wears better than coloured gels and also applies thinner for a 'polished' look instead of an overlay-type look. BOTH will stay on if applied correctly for a few weeks but the shine of Shellac after 3 weeks is still brillient where as I find on myself the coloured gels do have zillions of tiny scratches on the surface. Now I have worn both and I am giving a fair critique of both.
Shellac very much appeals to the woman who has natural nails and does not want them to be buffed or abraded or prepped as for enhancements ... she wants a polish that LASTS without chipping for at least 2 weeks and that is what she gets with Shellac (usually 3).
Just published yesterday in New York.
Vain Glorious | Shellac Still Going Strong - NYTimes.com