I´m aware i might have a problem here, and i can´t disagree with the advice given, first because the sun here is certainly EXTREME in summer and secondly all my mods are untested, i´ve got (what some people consider will be) a perpetually dismantled TR 7!
One of the enjoyments of restoration or modification is trying to get round all those problems that arise. I´ve come across an "intermediate position/decision" that could actually be an improvement, this would be to give the wipers a buff with one of those satinizing mops that leave a matt/satin finish, i vaguely remember the XJ6 Series2 having this finish. Time will tell if i get away with this one!
I wonder what kind of reflecting problems i´ll encounter with my solid wood dashboard with glass gauge covers...
George