If you are seeing the symptoms, the damage has already happened. Had you realized you had used too much sooner and acted immediately, flooding the planting site with water may have carried enough of the product down deeper into the soil that it might have been taken out of range of those roots.

Less is more when it comes to fertilizing azaleas, they are not heavy feeders. My soil is the right acidity naturally and doesn't need my interventon for ph, but I've never fertilized azaleas or rhododendrons at all. They are given a top dressing of compost in Spring, nothing more.

You'll simply need to be patient and wait to see what happens to your azaleas. If the damage hasn't been too extensive, they may recover over time.

In the meantime, review your management practices to see how and why this occurred. Over fertilization is something that should never happen.