I lent my styrofoam incubator to a friend and when I got it back there was a BIG spot that looked melted. There was a spot about half-dollar size that was almost through with about an inch or two around it that wasn't that bad. I took a paper lunch sack folded over and taped it over the hole. I plugged the bator in and it kept temp good so I tried hatching with it. It worked great. Still does, and that was about 20 years and I don't know how many hatches ago.
