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Old 21-10-2008, 15:11   #1
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Removing Hazing from Lexan

Hi All, I recently installed new lexan (hyzod) inserts on my sailboat windows and in the process of removing excess bedding compound with a compound formulated for that purpose I got some of that stuff on the new polycarbonate. It hazed and scratched it. Anyone got any solutions? Thanks Ed

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Old 21-10-2008, 15:19   #2
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It can be polished out starting with 600 grit wet sand, progressing to the finest grit you can buy, followed with plastic cleaner and polish. Too much sanding will leave you with an optical distortion. The very fine grits are hard to find, but are used by computer network installers for fiberoptic connections.

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Old 21-10-2008, 15:32   #3
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I got some kind of awful film on almost new Lexan while on the hard in Curacao (downwind of the refinery). After several experiments and almost giving up hope of a cure, this is what finally worked for me:

Have a small sanding pad

Start with 1000 wet/dry sandpaper and use plenty of water
Go to 1500 wet/dry sandpaper and use plenty of water
Go to 2000 ditto

Now you should be ready for Meguairs' PlastX -- it can be applied with a drill and a polishing ball. Every condition is a little different and might take some adjusting but this worked for me.

All of these products can be found in the USA at a good auto parts store like NAPA, though the sandpaper may have to be ordered for next day delivery.
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Old 21-10-2008, 15:46   #4
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I used to do non-pressurized aircraft windows with a buffer using Liquid Ebony. Any good machine glazing compound and a low speed buffer would work. The key is to keep it wet while applying pressure. As it dries, let the buffer just skim over it to remove the compound haze.
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Old 21-10-2008, 20:15   #5
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I've used Novus polish on the Lexan windows in our pilothouse. It's a three step process if you have deep scratches. I had some scratches from a grinder/sander in a couple of them and the #3 took them right out. First time I had used it and I was really impressed, it also made the hatches look like new.

I got it at a plastics store.

John Davidson
S/V Laurie Anne
1988 40' Brewer Pilothouse
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