Hello has anyone had a problem with any Gelish colours fading. I have had the It's a Lilly colour on for one week and then I went to do my sister nails today and realised the colour had faded on my nails and just wondered why this could be. Now I did buy my kit off of somebody who has had it since Oct last year but had not hardly use the kit if at all. Is there a shelf life on the nail polsih etc??