Our range of sailmakers tape is the premier double-sided tape for the sailmaking and cover making industries. polyester film is coated on both sides with an ultra high peel acrylic adhesive which is designed to adhere immediately to most types of sail cloth ,canvas and cottons. It is virtually non yellowing and resists most strains of mildew. Note: These basting tapes are left permanently in place and are invisible. If any needle gumming occurs, intermittently clean the needle with an alcohol or spray the needle lightly with a cheap silicon spray before sewing.