1. Brush off any rust or foreign particles. Wipe flange surface
thoroughly with a rag soaked in acetone or other suitable solvent to
remove grease or oil.
2. Insert fingernail between the paper backing strip and the tape and
strip the paper back three to six inches. Draw a reference line in
flange and press squared off end of tape against it.
3. Now, start laying the tape along the face of the flange, peeling the
paper backing as you go. To prevent the adhesive surfaces of the tape
from doubling back on themselves and sticking together, strip away only a
few inches of paper at a time.