Bart,
Did you get a hold oh Martin?
Second of all, what I have found is that you really have to try your best to create hair slip on an animal. Touch wood, we have never had a single case. I believe, and its only my opinion, that hair slip occurs when a number of factors are present. Not just something as simple as cooling the animal down as quickly as possible, which I guess is rule #1. We have hunted many animals during summer months, and the best we can do is cape the animals as quickly as possible and not a single case thus far.
When I was a youngster, I shot my first blue wildebeest. Without knowing about trophy preparation, the animal was skinned for a rug. Off I went home with the flat-skin, climbed to the roof with the skin and a table salt shaker. I laid the skin open with the hair side down. I "salted" the skin, but how much salt can come from a "shaker", right? That hide was on top of the roof in sun, rain and whatever for about 7 months. I then found out that you had to tan it, to get it soft. Got it taken to the tannery, who told me that the skin was in bad shape. Who could have guessed. That skin has now been with me for 17 years, without a single patch of hair slip. It still lies on my porch to this day.