HowdA....
First... have you checked out these:
http://www.samuelsweet.com/docs/RebalancingIntro.php
http://www.samuelsweet.com/HowTos/reb_FilePrep.php
The other thing:
Why not save yourself the added expense of investing in a 'fill line remover' and just use tip adhesive. Its basically the same thing (syanoacrylate resin)
Ill tell you why you would want to avoid using these type of product....
That line is lifting. Plain n simple.
If you stick adhesive, wet product, blue tack, spit and gum or whatever up there without properly sanitising and dehydrating first.... youre bound for 2 problems:
1. Greenies. You will end up trapping copious amounts of bacteria, moisture, and oil... this is a sure fire recipee for a first grade science project.
2. Weakness. After doing this for a few months... you will end up with an adhesive network running through your product. This leads to a substantially weaker nail and one that is more prone to discolouring.
The trick to getting rid of Phil the Line is to file up to the line. What that means is that you sont bother to file on the line... nor the product that has lifted... but bevel into and up to it.
The product that is no longer adhered will simply flake off without leaving a ledge or a line.
I hope this helps