Just a word of caution when using Rain-X. Last spring I tied up some parasol flies and used Rain-X to treat the parasols. The parasols were tied on using tippet materiel. Several days later when I went to the stream to fish with them, the tippet materiel had dissolved. The flies them selves were OK, but all the tippet materiel was gone. So, if your using a mono type thread do not treat your flies with Rain-X. BTW I've used this product for several years and have never had any problems except this one.