Do you know how much was filled in the orginal one? Depending on the quantity, the suspension effect varies, resulting in a different sound. In most cases, when you will to the brim so that it would look like overflowing, you are not at risk. Ferrofluids are 'super fluidic' make sure you are all set with clean target tweeters ready before opening them. There is a great chance that you end up wasting it, if not careful. Make sure you wear gloves.