I'm sure that most everyone hear has either seen or heard about the Magnaturals feeding/watering/hiding sort of things. I was thinking about using the Great Stuff expanding foam and making my own. I have access to a bunch of old computer hard drives that I can rip about and get the magnets from. I was thinking of just using a small/medium plastic box as the mold. I could use plastic sample cups to make the holder part in the actual mold or cut/carve it out afterwards. When the Stuff is dried, using a Dremel or Exacto knife to carve it into a more natural shape. Seal it with acrylic sealer (matte finish so I can paint it afterwards) then painting it to look similar to the Magnaturals. Should I be concerned about toxicity after the final coat of sealer has been applied? Or should I use something else to seal it with after painting? All input will be greatly appreciated.