I had the wrong bit but I tried anyway. I figure I can either hit it with a heat gun to smooth it out, OR maybe spray it with a light mist of Acetone, or MEK ??? Or I could put some Acetone on a cloth and rub the surface to smooth out the foam. This one was just a TEST carve. I will figure out the best bit and cut speed, etc. and then make the real tombstones, that will be sprayed with the stone surface paint to add some realism.
Acetone on foam always makes it dissolve. It will be uneven. Sanding might be Ok if the foam particles are tiny. But I know that theaters carve foam with a hot wire. Low voltage across a fairly fine piano wire bent into the shape you want.
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