I have been covering with polyspan for years and never had his happen.  I made sure the slick/shiney side was up when I covered the wing.  I filled it with dope and filled it as always.  Did not have any fuzzies at all.  When I have the covering filled adequately with dope, I put it on the paint stand and sprayed on a light coat of Klass Kote white and had fuzzies appearing everywhere.  I think my only solution at this point is when the paint is dry, to wet sand with a fine grit paper.  I have never had to do this so my question is what grit should I use to wet sand, 1000, 1500, 2000??? 

Thanks
Mike

2000 grit wet sanded should do it for you. 🤠

Thank you Larry. I just never had to deal with this before and have no idea what caused it.

Mike