Hi Everyone, I fortunately managed to pick up a nice and original 74 Bay Window from a farm on the boarder of NSW and VIC. It has a great patina on the roof that has never been treated. I want to prevent it from turning into anything nasty! What products are out there to do this and how effective are they? I am also curious about the effects on the surrounding paint as I don't want any discolouration. Your help is greatly appreciated! Thanks, Dan.