I wouldn't do it. For one thing, it's messy as hell. You'll get it all over the visor. For another, it'll melt your visor. And then there's the fumes. It'll probably "smoke out" all the fingerprints on your visor, making it impossible to see out of.
And the most important reason not to.......You won't be able to remove your visor (as easily) if you ever crack it or need to repaint.