Should not be a problem - the usual design range for these cpus is 60 - 95 degrees core temp.
When the coffee you spill starts to boil on the NetBook - then you have problems.
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Personally, I like to see my equipment running with a core temp from 40 to 50 degrees - -
Every 10 degrees hotter approximately halves the life of a silicon device, ratings be damned.
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A bit of trivia for anyone thinking to finger their heatsink (degrees C):
42 - Uncomfortably warm
44 - Painful
54 - 30 seconds to burn
72 - 1 second to burn
88 - Burn on contact
Human skin is a bit more sensitive than silicon (beach sand) to heat.
Not a surprise to anyone who has walked barefoot on a tropical beach.