You asked if the conditions were hot air temp, cold water temp? Yes..., it was an unseasonably warm fall day (87F) and the ocean temp was 63F. So, could you explain what forces were at play, re: causing air to bleed/hiss out of my board?
I tried the paper towel trick you suggested...all seems dry. Will try again tomorrow, but hopefully the result will be the same (dry).
Will look for the Hylomar. Is that something available in a marine/boating store, or an auto parts store?