What a load of old woman
Any ways
back to the topic as with a perspex screen. The only solution is to glue or bolt on a sandwich repair patch (unlikely given the location, directly in your vision) or basically you need a new windshield. So if buying an aircraft this should be taken off the price, plus bare in mind the damage to local paintwork replacing the screen will do.
Hardly see these fitted today. Mostly on old seneca's, commanche's and baron's. But have seen them fitted to some of the first two on airframes without boots. Really makes you wonder what known iceing condition some people will fly these into
