Yes, you can paint galvanized chain link, but the process is a bit more difficult as it requires additional prep work. Before applying the primer and paint, you must remove the original coating from the metal, which can be time-consuming. If the original coating is not removed, the primer and paint will not bond properly and cause peeling over time.

The number of coats you need to apply when whitewashing a surface depends on how opaque you want the final product to be. If you're going for a transparent, barely there look, a single coat or two may suffice. For fuller coverage, you'll want to use multiple coats. Another option is to use a less diluted paint to get a thicker coverage. 

If it rains after you paint your fence, you may need to apply another coat of paint after the fence thoroughly dries. This will ensure a good seal if the rain weakened any areas of the paint. However, if your paint had enough time to dry thoroughly before it rained, you should have no problem.

You can only change your neighbor's fence with their permission. A neighbor's fence is their property, and altering it without their consent could constitute trespassing or property damage, which may have legal consequences. If you have concerns or disagreements about your neighbor's fence, communicate with them openly and try to reach a mutually agreeable solution. If you believe the fence violates local zoning laws or property regulations, consult with local authorities or seek legal advice to address the issue through proper channels.