what material should i use for hand spun fiberglass roving

Hello,

i am trying to make  a globe of 50 cm in diameter with  fiberglass by hand spun. Honestly i tried many times by using inflatable beach ball but while i spun the fiberglass wet with epoxy it started to slip over ball. Whatever i did, i couldnt avoid sllipping. Is there any way of avoiding slipage ? Better to make a PU mold , fiberglass mold or else?  What i need is that fiberglass  should not slip over the mold  and should not stick to the mold neither. Anyone have idea or expri@ence may help?

Thxx

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