Lining up the grain with the decking, push a plug into the hole. Give the glue time to dry and then sand the plug flush with a random-orbital sander. As you work, before you reposition yourself as you make the long cut, always pull the blade backward and let the blade come to a full stop. When you restart, let the saw get up to full speed before pushing it into the wood. For pressure-treated decking, the boards can be secured with no gap. Given their high moisture content—you’ll notice as you he...