This is often a difficult thing to do. If it is really gel polish (and maybe you could find out what brand), the removal should be very similar to Shellac. You should probably buff the top coat and then wrap with remover as you would for Shellac. It will probably take longer than Shellac, so give it a good 10-12 minutes making sure to keep the pad saturated and in full contact with the nail. If it doesn't remove, re-saturate and re-wrap until it does.