or other heavy abuse still stains and/or damages the rig  materials. Scotchgard $^{®}$ is not harmful to today’s container  fabrics, such as para-pak and Cordura$^{®}$. There are currently  several Scotchgard ® formulas. The standard fabric and  upholstery formula is in the red can.  [Figure A]  Do not use  the rug and carpet formula in the blue can. After the rig is  completely dry, hang it in a well ventilated location. Following the directions on the can, apply the protector to  the entire outer surface of the rig. For those areas, such as  the inside of the leg pads, backpad, and bottom of the main  container, and light colored panels, such as white, etc., apply  a second coat after the first has dried. Do not intentionally  spray the hardware, housings, and clear vinyl CYPRES ®  window. After the rig has dried, it may then be reassembled  and placed back into service. It is very important that any repairs or maintenance of the  parachute and its related systems are done correctly so that the  parachute is always airworthy. This chapter provides detailed  step-by-step procedures for many repairs and alterations that  can be done by both senior and master riggers. All riggers  must learn to identify conditions that may be unsafe and learn  how to undertake the necessary repairs to return the parachute  to its original, airworthy configuration.  Chapter Summary 7-90