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Lately I`ve been using this strenghtner from Sally Hansen.
I bought this several years ago but never use it because I don`t find it very helpful for my nails unfortunately.
Anyway...lately I want to finish all my old stuff and try to use it.
I won`t recommend for the aim that it was claimed but just for a nail polish base it`s nice...so definitely NOT worth it..
I paid 7 euro for it just because I was hoping that it makes my nails stronger. It can be used as a base coat but I didn`t, because I was hoping that alone can be more effective that use in conjunction with other nail polishes.
* photos are mine please do not take without permission