I used plain ol krylon primer. I did have a can of high build primer, but I didn't think that was necessary. The fins on the barrel were a T-track with an adhesive back. It actually came with the blaster (purchased from a TDH member). I don't know who sells it, but it looks really nice once its on there. Sidewinder sells the Webley kits. I don't know the price, but from what I hear they are excellent casts.