By the time I routed the profile along the edge, I saw a knot would be visible on the finished project. So here's a fix you can try when you encounter a board like that.
Like most woodworkers, I've used the old recipe of mixing sawdust with glue, using the fine dust from my random orbital sander. But one problem with mixing with glue is that it’s hard to sand.
Teaching woodshop to kids: You can’t make it stick in their brains unless you make it stick to their fingers first. How'd my son Eryn end up crafting beer?