$12
This is a good ride favorite for waterproofing. We strongly recommend this over standard one step sprays and many other similar sprays.  This takes 3 steps but it really bakes in excellent waterproofing.  It takes your clothing back to where they were when they were new.  We say bake in because you spray this on after washing it and then put it in the dryer or iron it to get it waterproof.  If you follow the instructions your outer layer you will have a jacket or pants that will work great.  If you don't follow the instructions then it won't.  You should not use traditional detergent and get something from Revivex or another waterproof clothing detergent.