I was cutting out some speaker spacers in my car and wanted something that wasn't wood because wood and moisture don't get along and car doors absorb moisture. her when it rains. Many people on car audio forums recommend HDPE cutting boards because they're cheap, common, and fairly dense. I've tried cutting them with general purpose routers in the past and while that worked reasonably well I was happy with the results as the plastic melted too much and the cut quality suffered and I had to make