I have my plan for backsweetening my Winexpert Vintners Reserve Riesling thanks to responses from my earlier question. As per the kit instructions I added the packets of metabisulphite and sorbate. I degassed and added the clarifier. I will rack the wine after two weeks and then sweeten. My question, do I need to add additional metabisulphite and sorbate or will the amount I added already be sufficient? My plan is to wait one week after sweetening before I bottle. Thanks for any advice.