(Master craftsman William LaRue recommends using 100-, 120-, 150-, and 180-grit sandpaper, and finishing with 220-grit.) If your board has really deep gouges, you may want to start with 80-grit ...
The top-notch Kidde i9080 runs on a 9-volt battery, includes a hush button ... which logs the highest CO reading so you can see whether there was a problem while you were away from home. One of the ...