Simple answer? No

Why? Because this will only handle the visual aspect of the problem but not deal with the root cause of the problem.

The reason it started to get rotten would still be there. For example, let’s say you paint over some rot on your wood siding. The wood will look harder and like it has any problems anymore.

But, what this does is create a haven for moisture, spores, and insects to live in. Unless this problem (the root cause) is dealt with, all of these things will come back.

The safest thing to do when you find any sign of rotting wood on your home exterior or interior walls is to remove that section and replace it with new material.

This will ensure that you no longer breathe mold spores into your lungs while simultaneously preventing future rot from occurring behind paint jobs where you can’t see it.

Are There Any Better Solutions Instead Of Painting Over The Rotten Wood?

Yes, there are three common ways to deal with such situations:

Board Replacement
Ideally, the best solution is to replace the wood. This will give a new look as well as offer a longer lifespan.
Wood Sealing
When board replacement is not possible, your next best option would be to paint the rotten areas with a sealant. This will prevent insects and moisture from getting in.
Chemical Restoration
Wood painting doesn’t always solve all of your problems. Some chemicals can restore the damaged areas of wood without having to remove old paint or even sand off old finishes first.
These chemicals are usually non-toxic, so you won’t have to worry about getting yourself in trouble if you decide to do this.
Commonly used in commercial restoration work, these treatments don’t always come cheap.

While all these methods can be DIYs, you are never guaranteed the results. The best way would be to get a professional to evaluate the damage and advise on the best possible solution.