First and foremost, these are not decals in the normal definition of what most modelers think. They slide off the backing sheet like one but then they must be glued to the interior of the model with Future or CA. I will probably use RC-56 canopy glue since it behaves like white glue but is water resistant when dry. There is no placement guide as to where they go or any instructions on how to adhere them to the model nor is there any help on their website. Cyberscale Online and Large Scale Planes were a big help with various methods to attach them but you need your own references to figure out where many of them go. I cannot recommend these to anyone except to experienced/advanced modelers.