A Bottom Fender!
Now that it is raining these days it seems the bottom of my board gets muddy.
Not sure but probably a simple flexy thing on the bottom will do prevent this.... having a V ending will help dripping.
But why bother?
Nice idea. It would be a mud flap or close to it. Main issue would be to make it long enough to keep debris off but not too long to get run over with the tire if going in reverse.