Electronic – Altium 15 – Cannot see traces in 3D view

I suggest you combine the two methods. Drill a hole near the traces and thread a thin bare wire through the board, lay it along the exposed traces by a few mm and solder it on both sides.

If you don't have such a wire handy, just strip a piece of stranded wire and use one of the strands

Nobody will notice unless they look very carefully, and it will be reliable.

Hopefully I understood what you are trying to do.

You have to create a mechanical pair.

With a PCB open click Design Board Layers and Colors (Shortcut: L)

In the bottom left corner, you'll see a Layer Pairs Button. Click it.

Add your layer pairs together (like Mechanical 14 and Mechanical 30).

That's it.

Now when you switch components between layers, the items on the mechanical 14 will switch to mechanical 30 and vice versa.

I'll try and add some images and format this answer to be a bit more clear later on.