tubthumper
Regular.
unless you get that moisture resistant mdf I wouldnt use it as it get really funny when damp,
far better to make it out of insulation expanded polywhatever, lighter and will keep heat in also much easier to cut ( bread knife will do at a pinch).
far better to make it out of insulation expanded polywhatever, lighter and will keep heat in also much easier to cut ( bread knife will do at a pinch).