Once you reached 100 in INT it automatically opens up the Powercast skill.
I've just looked at the manual and I can't see where it even mentions the expert skills let alone tell you that Powercast is just for actual spellcasters.
When I first started playing Wiz8 three years ago I made the same error by putting points into Powercast for a Bard, imagining that it would let me use instruments consistently at level 7 all the time and doing away with fizzles. Oh well.
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