This is a top tip that has worked for me time and time again. When it comes to blending nails, the key is to protect the natural nail and by following this simple tip your will find you get amazing results and no damage to the natural nail plate.
Simply apply an extra layer of glue to the seamline where you can visibly see the nail tip. The best way to apply the extra glue is to carefully use the nozzle of the glue and apply across the line. Once you have completed this, allow the glue to dry and then you can blend.
Below is a short video demonstrating how to protect the nail and apply the extra glue.