Lol... Well among other things, you're at least talking fibreglass particals getting sucked into the motor, which could cause big problems.
If you do use fibreglass, try to get the oil covered stuff, it's like a weird greenish brown colour. I don't even know if they sell it anymore but I have found some in some old speakers and used to have some laying around the house. You won't have much of a problem with it.