CA and baking soda is used to fill in where the modeler should have put wood. Not ideal, but better than nothing I guess.

The most important things to consider when repairing are alignment, strength and weight. Alignment should be obvious. Strength and weight tend to compete with each other. Make your repairs adequate, but try not to add any additional weight. A little extra weight is often hard to avoid, but if you have a 5lbs plane and after repair you weight 5.5lbs… you did something very wrong. Too often I see globs of epoxy, tons of extra wood, etc. I even saw one post a while back where someone was using construction adhesive to build with… why not just use brick and mortar? Sarcasm aside, I think I made the point.

When repairing, unless there is a terrible flaw in the design, keep in mind the planes that fly best often can’t handle rough ground treatment. If you strengthen (i.e. add weight) such that things don’t break as easily, you often end up with a worse flying plane that is actually more likely to crash, and when it does, the new failure point will move to some location that is an even larger pain to fix. For example, landing gear blocks, pilot doinks landing and tears them out. Easy fix, but pilot globs in a bunch of epoxy to be sure they don’t come out again. Next doinked landing, blocks hold, but wing spar breaks just past the epoxy globs, which is a difficult repair.