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The fibreglass shouldn't feel tacky, I'm not sure what's going on there... there shouldn't be any need to do any sanding or cleaning with acetone or anything like that. It just does take more effort to seal tacky tape than simply applying it to the mould, you have to really go around it inch by inch, pressing and pulling and stretching it etc. If your thumbs don't hurt afterwards, you're either doing a very small mould or you didn't do enough pressing!
Can you post a picture of your setup?
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