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growing up we had these ramps for bikes. pretty small but you could move them anywhere and eventually we learned that you could add it to any lip to make it a bit poppier. anyway, its completely hollow. Im curious if anyone has used this a a mold for building lips quickly. particularly for spots that you might get booted from.
my thought is that you could stuff it with snow and maybe some water at a safe location and then bring it in and put the mold ontop like a sand castle mold. has this been done?? is it worth trying?