I didn't get hdpe ears with this kit, just the abs one's. Yeah, the finish is like a milk carton. I put a good coat of paint on the helmet and still waiting for the paint to solidify. Sanding hdpe is difficult, so I kept it to a minimum.
The eyes and teeth were cut with an xacto knife and not sanded smooth. I am going to order some more humbrol gray paint, the new on seems lighter than usual. After using #400 to lightly scuff the helmet, I wiped the helmet down with
acetone and then used a plumbers torch, very quickly and not to close. I read on a hobby site that makes hdpe rc helicopter bodies, flaming the hdpe will make the paint stick better. We'll see if it helps.