your origional down to the mold base. This prevents the origional
from floating in the silicone which could ruin your mold.
sure your mold box (here we are using some currugated plastic)
has at least 1.0in of space on all side of your foam mold.
and bend another peice of corrugated so that it fits around
your foam mold. Make the sidewalls approximately .25in away
from your origional.
hot glue on your sidewalls to fasten and seal the wall into
place. You can also glue point to put the wall in place and
seal the gaps afterwards. Be sure you have a good seal around
the base of your mold box as well as the seams to prevent the
liquid rubber from leaking out before it cures.
the cardboard wall that you made to the base that you just
the bottom of the cardboard wall to the base with hot glue.
can also buddy a lot of holds together into one molding box!