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I have found out over the years that most 2 in 1 nail products that promise to be a base and top coat all rolled in to one are pretty useless with the exception being Sally Hansen Diamond Shine which is actually really good and my preferred top and base coat.
It isn't the cheapest as it costs £8.69 from Boots but it really is worth paying the extra for it as it is such a good product and it really does work well.
It is a clear polish that promises to seal the nail surface with diamond particles and leave it rock hard for the nail colour to grip to and to protect nails and intensify the colour and leave it with a shiny surface.
This goes on really smoothly to my nails and once it is dry really does make a great base on which to put colour on top. With most nail base products I actually find that the colour polish is more difficult to apply as it always seems to be a bit grainy and the colour always seems to not go on very smooth. With this on my nails the colour just glides on my nails and I usually only ever need one coat of polish.
As a top coat it works wonder in making my nails super shiny and the colour really is intensified. It also really does strengthen the colour and makes chipping it really unlikely as they feel rock solid.
I also like to use this after a manicure as it really does help my nails to look their best for ages afterwards and stop them from splitting as there is nothing worse than going to the salon and spending a fortune only for your nails to split afterwards.
I don't use this on a daily basis with my nail polish only because I am lazy and can't be bothered spending the time to apply it and the colour but I always make sure and use it if I know that I am not going to be able to take off my polish and reapply it on a daily basis because I know that this will make it last and look its best for as long as possible without chipping and becoming scabby looking.
I also tend to use this when I am putting on a nail colour that has glitter in it as this stops the colour from being gritty and also helps seal in the colour and glitter.
It is also really quick drying so that when I do have to use it I know that although it is a faff having to put on a base then colour then this again that at least it isn't going to take me all night to do.
Although expensive I would definitely say this is worth the money. A little goes a long way and it really does help improve the look of your nails while wearing polish.
Superior base and topcoat with brilliant multi-faceted diamond shine finish / How it works: Sally Hansen Diamond Shine Base & Top Coat contains both coats in one dual-purpose bottle / As a base coat, this exclusive formula with diamond particles, seals the nail surface, leaving a smooth, diamond-hard finish that grips nail colour / As a top coat, the formula penetrates manicure layers and quickly dries to protect nail colour with a brilliant multi-faceted diamond shine finish / Quick dry and smudge proof formula protects nail colour against chipping / Dries to the touch in under a minute / Directions for use: Shake gently / Apply one coat of Sally Hansen Diamond Shine Base & Top Coat to clean, dry, bare nails and let dry / Apply 1-2 coats of nail colour and let dry for 2 minutes / Finish with a second coat for a shiny top coat /