yeah. i just taped some paper bags accross the frame, pushing it down so that it contoured the frame, and then just made a giant blob in the general shape i thought i'd need. i waited a day, then went at it with the electric bread knife. the upside to great stuff---no trying to figure out how to make rigid foam sit on the frame properly before beginning the great carve, it's easy to fill if you over-carve, and it sands easily. however, you do have to wait a while after filling and it tends to leave air pockets here and there even if you are very methodical when making your blob.