I haven't used the kits from finakits.com but if they're anything like the one i got from SD , then you'll have problems with it mixing like i did. I use A's kits and the oil/solution mix right away after shaken. With the kit i got from SD , i would shake it and the stuff would separate and i'd repeat it again and again , but it still wouldn't mix. Needless to say i have never gotten anymore kits from them. It sounds like you have the same problem .