In my instruction I think I said to add a drop or two of linseed oil to the shellac on the rag to keep the rag from sticking. I did say to use a lint free rag in the french polishing. You can add about a 1/4 cup alcohol to the shellac to thin it down some. You go in a circular motion when french polishing and then swipe with the grain at the last. If you use a rag to apply shellac always use a drop or two of linseed oil. In your case just brush on three or four coats of shellac. You can sand lightly between coats to remove any brush marks. Wait a day between coats to allow curing time.