Using a drywall sander is a great way to finish off your new walls fast. Sanding drywall is usually the most time consuming part of any drywall project, and it can often leave you feeling frustrated because it is so hard to ensure every single flaw is sanded to perfection. While a sander is one of the drywall tools that can not guarantee a perfect surface, it will save you hours of effort with a hand sander and provide a consistent finish over large stretches of drywall tape and mud.
Sanding drywall is never fun
Sanding drywall is a thankless, monotonous task. If you use a hand sander, it can take hours and leave your arms feeling like cooked spaghetti. Drywallers who spend every day installing drywall are experts at sanding drywall, but you will never find one who claims to enjoy it! 
Still, sanding your drywall is the most important part of finishing your drywall project, because the slightest flaw in your mudding can show through many layers of primer and paint.
A drywall sander can provide even sanding over a wide area, and also helps by collecting dust. This not only keeps your room cleaner but helps increase visibility, so you can tell when you have a spot. Some sanders have been to make drywalling go 75-80 percent faster than if you were using the traditional sand block and “elbow grease” method.
You can use almost any power sander on drywall, but it is a good idea to select a special drywall sander that is built to deal with the fine grit sent up. You should also select a machine that operates at high rpm, so that your walls will receive the maximum sanding in just a short application of the sander.
The Makita finish sanders BO4556 line
One of the best ways to sand your new drywall is with Makita finish sanders, B04556 being the starting number for all models. Makita prides itself on providing some of the best tools on the market, with prices low enough to allow any do it yourselfer to buy a Makita sander to use for drywall.