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Old 04-18-2019, 02:20 PM   #1
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Pano Window Stone Guard Removal

I always dread removing the front pano window stone guards because reinstalling the 1/4 turn screws are so difficult. Had to do it today in order to reinstall a spline on the inside of one of them. Reinstalling the guard this time was easy but I noticed there's a 3/8" long rock crack in the middle of the plexiglass. Cant see it from the outside. Has anyone tried repairing the plaxiglass or do I have to replace the entire stone guard?
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Old 04-18-2019, 04:01 PM   #2
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You can replace the plexiglass, the frame comes apart after drilling out a couple rivets at each 90 degree corner and removing the straight frame section to allow the plexi to slide out.
Others here have said acetone in the crack will weld it closed.
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Old 04-18-2019, 04:49 PM   #3
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Stop drill the crack and use a syringe of acetone to weld the crack.
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Old 04-18-2019, 06:30 PM   #4
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Pano Window Stone Guard Removal

More detailed:
Stop drill: Drill a 1/16Ē or smaller hole through the plexiglas at the exact ends of the crack to stop it from spreading further.

Acetone weld:
Remove the rock guard if possible, and lay it face down on a clean padded surface. Use a tiny brush or disposable syringe and needle to put just enough acetone into the crack to wet the interior of the crack along its full length.

Donít get acetone all over the place, it will damage the polished surface of the plastic.

Let it sit and dry and it will weld the crack shut. Donít move it until itís fully dry. If you missed some of the crack, repeat the acetone welding carefully.

If there is a haze around the crack, carefully and gently use a plastic headlight polishing kit to restore the surface shine.
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Old 04-18-2019, 08:17 PM   #5
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Quote:
Originally Posted by rmkrum View Post
More detailed:
Stop drill: Drill a 1/16Ē or smaller hole through the plexiglas at the exact ends of the crack to stop it from spreading further.

Acetone weld:
Remove the rock guard if possible, and lay it face down on a clean padded surface. Use a tiny brush or disposable syringe and needle to put just enough acetone into the crack to wet the interior of the crack along its full length.

Donít get acetone all over the place, it will damage the polished surface of the plastic.

Let it sit and dry and it will weld the crack shut. Donít move it until itís fully dry. If you missed some of the crack, repeat the acetone welding carefully.

If there is a haze around the crack, carefully and gently use a plastic headlight polishing kit to restore the surface shine.
So what do you fill the two 1/16" hole with? Any chance of just doing the acetone without the holes?
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Old 04-18-2019, 08:29 PM   #6
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Problem is that the crack will continue to travel without the holes. Keep them small, put a tiny daub of clear silicon caulk in the holes if they bother you.
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Old 04-19-2019, 07:22 AM   #7
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I have used this product to weld pieces of plexiglass together with excellent results. Being very thin it should have no problem getting into a crack.

https://www.amazon.com/Weld-Acrylic-.../dp/B0149IG548

If your having trouble with the 1/4 turn screws you might need to replace the rubber mount. Had a couple of mine go bad and not allow me to turn and lock the screw.
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