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First of all you will need to determine that the surface is absolutely NOT a low e metallic surface such as an AR coating or a tin oxide low e coating from Pilkington or another manufacturer. These coatings are very easy to scratch with a razor and the razor will not "stick in" like it does on acrylic, polycarbonate, or mylar film. So the razor tip will actually slide on such a metallic surface leaving a rather noticeable scratch! Not good. There are some simple tests for metallic surfaces such as a special electronic tool. Or an LED flashlight. Metal surfaces feel different as I demonstrated in another video.
Nonetheless the tip of a razor applied gently to a plastic surface will actually sink in just enough so it will not move easily as demonstrated here. This is true for plexiglass (acrylic), lexan (polycarbonate), and mylar (polyester). Single edged scrapers and larger handheld razors such as this Triumph work very well.
Plastic glazing is turning up everywhere these days. You would never want to scratch it as it can be very costly to replace. Further if it has paint on it this might be one of those situations where it would be best to just walk away. Especially if you do not have a foolproof way of safely removing whatever is on it. If the owner is will to sign a waiver absolving you of any and all responsibility then have it it. But again only if you feel very comfortable. The most safe course to follow is just to walk away. This does not mean you are not a professional. Just show them this little video and they will know that you are!
Written by Henry Grover Jr.
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