phil and others, thanks for sharing your experiences. delamination is the last I am looking for, I just repaired several of those spots on the old hulls... :-) I will cover the boat with a cover anyway. Here is a qoute from the manufacturer regarding temp:
"Most foams have a HTD of approximately 120 dergrees F.
Testing is usually done to a max of 160 degrees F but at that point you will see distortion of your sample. Resins usually have an HTD of about 140 degrees F."

Phil, what are the outside temperatures you encounter and did you ever measure the hull temperature of your black beauty when exposed to the sun on a hot day?