You need to treat it like paint, unfortunately, it is nearly impossible to use correctly like that. I've never had any luck with the VHT nightshade. I know a lot of guys who make a good living doing niteshades with VHT, but it's like a gift. You either have it, or you don't. Best advice I can give is to tell you what i tried.
go to your local lowes or michaels, where ever you can buy plate glass cheap. get a couple 4x6 pieces of glass(lowes cuts glass for free) and practice practice practice until you get it how you like, then do your lenses.
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