Cheap and Strong
I’ve used the brown paper method on several projects including my latest flying wing. It makes and incredibly strong wing and can be finished in couple of ways. Best of all its cheap all you need is some brown parcel paper and PVA white glue also known as Elmers in the USA.
If you can wallpaper a room then you’re already an expert. The process is almost the same and just as messy!.
I mix glue to a milky consistency 50/50 with water and use brown parcel paper. Don’t use the recycled stuff it doesn’t seem to work as well.
One word of warning make sure you do the whole wing or half span in one session otherwise you can end up with warped wing, because as it dries it will shrink and pull it out of shape.
My video which was published in Feb 2018 shows the whole process start to finish on my foam flying wing and the other models I’ve used it on.