So it turns out that the stairs are not all flakeboard. Only about half of them are. This is awesome in that a few of the stairs are solid wood. It is not awesome in that the two odd-shaped stairs are the worst plywood I have unearthed so far.
Its tough to show how pitted and gross the wood really is, but some of the cracks went down about an eighth of an inch. At this point, it is not so much about filling as it is about rebuilding. I started by using DAP, but it didn't go very far.
The first two passes still left quite a few holes. This is definitely a multi stage process.
Then came the Bondo. It seems to do a little bit better on deeper holes because it doesn't shrink as much. I did the worst parts of these stairs, and wound up running out of Bondo. Since I can't find it locally, I've been ordering from Amazon, so there was a bit of a delay on this.
After three layers of Bondo, I covered the whole thing with wood filler and sanded some more. It's still not pretty, but at least most of the holes are filled. The edges are still really gross, but I'm hoping they don't show as much once everything is painted.
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