The Nikwax wash-in stuff (Tx-direct) is the best on the market in my opinion. I use to work the outdoor retail industry and I have tried every type of waterproofing imaginable. The washin stuff waterproofs ever seam and gets right into the fabric. The best part is it is a polymer based product and as it breaks down over time (like all DWRs do) you can just put your article in the dryer and it magically revives the waterproofing. I have used that stuff for years in Vancouver Canada (known for it's wet weather) and I usually only had to re-apply it once every 2 years. The spray on version is ok but not nearly as good as the wash-in stuff. Make sure you follow the directions closely when you use it.