Sorry for the little explaination in the PDF file, but I'm very busy at the moment.
If you would like to stay in a safe zone I would recommend to use absolutely no higher pressure than 60 PSI (about 4 bar). And believe me, this is already an incredible amount of force at your press. As you mentioned 45 PSI will also be enough to press a ski.
But also be sure you have class 8.8 (or higher) threaded rods, normally in the Netherlands these have a yellow dot at the end of the rod, otherwise your not sure about your material quality (DIN / ISO norms) and therefore not about your own safety.
@bigKam: I will write an article about the press calculations / FEA in the next weeks.
Buuk
my ski press has been started
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