I just got a little bit on and it makes it inconsistent in that part, I'm sure opti glass would be fine/good. Don't think the opticoat is supposed to go on glass.@Zextraterrestrial
what problem did you have? My detailer has offered to put Opti Glass on the windscreen for free but I’m thinking of telling him to put it on the sunroof instead. Not keen on affecting the wipers.