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Old 05-21-2015, 12:20 AM   #1
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Cracked Plexi Front Windshield

I have a rock fracture in my right front plexi window shield. 1 1/2 inch.

Is there a way to repair the fracture?

Will it grow in size and eventually fail if not repaired or replaced?
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Old 05-21-2015, 06:48 AM   #2
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I have one just like it. I ordered a Pink Flamingo vinyl decal on Amazon and placed it over the crack. Looks great
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Old 05-21-2015, 07:00 AM   #3
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Plastic fabricators use a thin solvent based acrylic adhesive to glue Plexiglass together for products made from of sheet stock. I have never tried it, but, low viscosity epoxy used to fix rock chipped auto windshields might be able to wick in and fix it.
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Old 05-21-2015, 07:34 AM   #4
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That crack means it did its job! Glass cracked is a much more expensive and complicated problem. I have several like that. When the time comes for replacement, I will go with polycarbonite instead of plexi. My understanding is that poly can make the bends (out of flat stock) without heating or buying OEM parts.

Mine have not grown from their original size in 3 years (oldest one)
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Old 05-21-2015, 12:27 PM   #5
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Not sure what type of TV you have, but I have used some removeable mud flaps similar to these on my PU TV and have never had any thrown rock problems...
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Old 05-21-2015, 12:30 PM   #6
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Ummm, I have rock tamers. Flying rocks from oncoming traffic is my probable cause when considering the location of my cracks.

BTW, Rock Tamers DO reduce the majority of body and window protector damages. Never hook up without them.
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Old 05-21-2015, 12:38 PM   #7
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While we're on the topic: I lost my entire plexi guard-frame & all from wind while in the storage facility. (Let's not discuss the details, ok?) I have the frame...can a replacement plexi be done or do I have to buy the whole thing??
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Old 05-21-2015, 12:49 PM   #8
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626, (BTW, welcome) use the search feature for rock guard or plexiglass, or window cover. Somewhere around here there are some older threads on this topic. As I recall, Plexiglass can't be bent around the curve of the side units without cracking unless it can be heated in a large oven. That obviously presents problems. IIRC, polycarbonite can.

I have never seen just the curved plexi available alone and an entire guard segment would have to be purchased.

Flat stock poly and plexi can be purchased locally...just google it.
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Old 05-21-2015, 12:57 PM   #9
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will fracture grow?

To answer your question, the fracture I have hasn't grown in two years.
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Old 05-21-2015, 01:11 PM   #10
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Thanks everyone for your suggestions.

I'm pretty certain that the fracture was caused by a damaged right side mud flap not providing complete protection.

I'll try applying helicopter tape on either side of the fracture to help stem it's possible spread.

BTW: The mudflap most likely saved the new Michelin tire from damage when I backed into a hidden piece of rebar. Installing a replacement flap today.
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Old 05-21-2015, 02:06 PM   #11
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Polycarbonate (Tradename- Lexan) must be baked (to remove the moisture) before it is heated to 350 to be bent to match the curve. It will resist stones much better. Plexiglass is acrylic and has very little elongation before it cracks. When hit by a stone it cracks. It is cheaper than Lexan.
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Old 05-21-2015, 02:09 PM   #12
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Hmmm, I gotta find that old thread. I thought it was polycarbonate that could bend (at least enough to make the curve of our AS rock guards). I can't even remember whose post it was.
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Old 05-21-2015, 02:31 PM   #13
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dwight, I think you're right and I have it backwards. I still can't find the particular thread I was looking for, but some others dance around it. A bunch of references to the "cyclops" guard and Lexan bending cold into the frame...but they don't have a radical curve. Several references of Plexi working for cold fitting into the wrap arounds. I just can't find the thread about Lexan used for wrap arounds.
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Old 05-21-2015, 02:37 PM   #14
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I have used Rock Tamers for years including a trip to Alaska and back to Fort Worth. No cracks or dents on the stainless steel rock guards or plexiglass ever. On the cracks, try to stop drill just beyond the end of the crack with a plastic drill bit. It will keep the crack from spreading. I'm not sure if epoxy based fillers will work on plexiglas like wind shield glass.
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