If you have arrows that have been "buffed" to a smooth finish you will have to give the glue something to stick to, either use a razor knife to scrape off the buffed finish or use something like an SOS pad or kitchen sponge, wrap it around the arrow and spin the arrow while moving the SOS pad up and down the shaft where you will be putting the fletching. This will create spiral scratches up and down the shaft that the glue will adhere to, I had to do this on Beman and Carbon Express shafts here lately.