Another hint: Add a bit of dishwashing soap to the water you use to clean off your wet sanding paper and rinse the wing surface. It reduces the amount of residue that builds up on the sandpaper and makes it last longer.

And remember: Patience is a virtue. Take your time. And then take some more time. Good things come to those who exhibit patience.

At least with things like this. Other things require more immediate results. That's why high explosives were invented. Mining would take a LONG time if you had to use sandpaper.