I have some stains in my gel coat that was caused by residual shrink wrap tape that I thought I had removed but infact did not get all of it.After haveing left the boat in the water last season for six months the residual tape residue has all disappeared but a black stain has remained in its place.I have tried FSR to get it out but with no luck.It is in the lower bow area of my boat just above the water line.Anyone have any suggestion?The stains seem to be right into the gel coat and are black in color.<br /><br /> Thanks PT