I've seen patterns for hats with visors that don't mention duct tape. I don't see why you can't just use the mesh. The only reason I see to use duct tape is to help slide the mesh in without snagging, but that could be handled if you're just careful.
I'd suggest googling patterns or checking out Ravelry and seeing what is the general rule.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry