Preserving a pumpkin for a few days after it's carved
Ok, so this is technically not a *cooking* question, but is a sort of food question... here's the deal:
Every year for the last 5 years or so I've thrown an all-day Halloween party where I cajole my friends into carving an ever-increasing number of pumpkins. Last year I think we carved 34 (feel free to try and count in the attached photo) so this year the goal is 35. This year though (and the next two) present a challenge -- preserving the pumpkins.
You see, our party will be on Sunday the 28th and Halloween won't be until Wednesday the 31st. If the weather is cold enough the carved pumpkins will likely be fine but the weather is always a crapshoot here at Halloween. Last year is *snowed* on Sunday and was almost 70 degrees on Monday.
I've read up a bit and the options out there seem to be 1) a borax-based spray called "pumpkin fresh", 2) soaking the carved pumpkins in a bleach solution, or 3) spraying them with hairspray. (The goals being to retain moisture and/or retard bacterial growth.)
So, do any of you have tried and true carved pumpkin preervation techniques? Have you tried any of the above? Opinions? Advice?