yeah just 1 layer, till you get the hang of the spine, Those file marks can have sharp corners, and it would be a shame to mark a good strop.

The tape itself doesn't matter. You'll see when you get it that at the wrong angle they have a fair bit of an edge to them The gold wash is good on the dovo, so your not going to damage it with the tape.

The other thing I have to watch on my dovo is the bottom of the tang under the pin. There is a little spot that sits inside the scales that likes to get a rust spot.