The kind of bondo that you need comes in a can that looks like this
They also make a near-identical fiberglass bondo (green instead of red), and that is what I have been using. I think the one you got is to fill in voids left after you have already gone over the surface with regular bondo body filler.
Kyo wrote:"does anyone here know how to fly a plane?"
tactile switches....one side of the switch going into the postive(left) side of the button ( if there's no little circle of exposed copper, scratch up a trace) and one side going into ground.
On the right side. You will see multiple traces pool together to make a bigger trace. expose some copper there and solder one side of your switches there.