These can be super tricky projects. Most natural doors are only a thin veneer, not solid wood. because of that, there are only so many times it can be fully refinished like what we did here. To bring this door back to life, we had to do a full strip, which is an extensive scraping/sanding process using several different sanding grits to get an even uniform surface, then restain and seal. If someone were to sand through that veneer, the only way to get uniformity again is to fully prime and paint the door. Luckily we were able to rescue this one! Now, with a regular maintenance coat, before it gets too far gone, this door can last many many more years.