We use this every year and it keeps the pumpkin from rotting/molding, etc for about 15-17 days or so.
Other Pumpkin Preserving tips that our Members and Fans have shared are:
Soak the Hollowed out pumpkin in a solution of bleach water (1 tsp bleach per gallon of water) overnight. Then spray it
Make Your Own Pumpkin Fresh- Mix 1 Tbs of Borax with 4 cups of water, spray the pumpkin liberally every other day. This is a fungicidal spray. This lasts 12-14 days
Coat the inside And outside of the carved pumpkin with white school glue, let it dry. It dries clear and helps prevent dehydration of the pumpkin. This lasts about 5-7 days.
Coat the pumpkin inside and out with Vaseline (aka petroleum jelly). Containers of petroleum jelly can be found for about $2 at many dollar/discount stores. This lasts 7-9 days
Seal a carved pumpkin by spraying it with an Acrylic Spray (found in the Home Good Department of your favorite big box store) or at lowes, home depot, etc. Be sure to spray it OUTSIDE as the fumes can be overwhelming.
Following the carving and treatment of your creations, try to keep them at temperature of 62-65F for best preservation. It generally takes about 48 hours for mold to start becoming apparent, so be sure to re-treat as needed.
What are your favorite pumpkin preserving methods?