In reply to Tall Clare:
Fabsil (Gold) dissolves the tape glue or separates the tape from the fabric. Though not immediately, you will notice it in a year. Mc Nett seam sure is then the cure. Take the loose tape off and brush Seam sure on the inside where the tape was. For Seam Sure use your own brush, the McNett brush is not so good. You will paint it upside so best is to paint it with your own brush from a jar.
Anyways best is not to paint Fabsil on the seams.
I just paint it on with a brush (not covering the seams) and leave it to dry. Works like a dream. Good stuff.