Polyester netting fabric is often used for sheer draperies. The polyester fibres in the netting allow the fabric to drape well, resist staining and fading, and to never need ironing. Polyester also makes the fabric resistant to damage but sometimes, in spite of the quality of the fabric, a rip or damage can occur. Repairing the tear is usually worthwhile if the fabric can continue to be used in the manner it was designed for.
Isolate the torn area on a small quilting frame. Lightly stretching the netting across the frame will enable you to bring the damaged sections together in the most natural way.
Trim any stringy sections of the damage to an even length.
Paint fray check adhesive along both the front and back sides of the netting and along all damaged edges. Allow the fray check to dry for eight hours.
Match the colour of your thread to your netting and unravel the thread to make it thinner. Most thread is spun from smaller strands to make the resulting thread thicker and stronger. To thin it, cut a length of thread. Separate the strands and gently pull on the strand ends. The main body of the thread will spin and sometimes tangle as the parts separate. Use a reduced strand for the mending of very fine materials.
Mend the tear using a very fine needle and very tiny crossover stitches. Bring the edges that are damaged in close alignment and secure them together with a crossover stitch. To perform a crossover stitch, bring your needle up on one side of the damage within 1/8 inch of the damaged edge. The non-fray should help hold this edge together at this point. Cross over the damaged edges and pierce the netting 1/8 inch from the damaged edge. Repeat. This is a cross over stitch. Space your stitches 1/16-inch apart.
Consider adding a netting patch along a long tear. This patch can be harvested from a seam or hem area. Attach the patch to the netting, matching the mesh holes when possible, with a fabric adhesive applied to the back side of the netting.