If using paper bags for backing how many layers do you use?  What about silk neckties from goodwill?

Now I have to come up with paper bags.  I have not seen any of those at our grocery store in years.  I do have a goodwill just down the road for neckties though.

You can go to lowes or home depot and they sell the brown paper that you looking for. It will be in the painting section and usually comes in large rolls. As for how many layers I would say one but I have never used the paper.

Pac I use one layer of brown paper and it's available at Home Depot or Lowes in rolls for cheap. I have no experience with silk my self. Generally speaking the backing is just to keep splinters from lifting or to help a less than perfect board or stave stay together so less (less weight), so to speak, is more.

One layer of any of the backing materials you mentioned is all you need.

a red oak build-a-long i just read had 3 layers of drywall tape and TB2, is that to much?
or just being safe?

Gordie, I used the same build-along and my bow broke big time.  I feel it was unnecessary for three layers.
Stan

It is too much in that it is mostly added physical weight which will slow down the bow and can add hand shock. One layer will do the intended job.