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Old December 16, 2017, 11:08   #1
Casqui1541
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Repairing Crack In Plastic L1A1 Handguard?

Has anyone found an adhesive/epoxy that works for repairing cracks in the plastic
(Maranyl) L1A1 handguards. I need to repair a crack that runs along the rear flange part that goes into the handguard retaining ferrule on the rifle. Due to flexing of the handguard when installing this area is under tension.

Thanks in advance. I'd rather go with a known solution right off than have to go through a process of elimination of things that won't work.
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Old December 16, 2017, 12:58   #2
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Jonesboro? My sister lives in Truman!
Not sure what temp maranyl melts at. A trick with ATV fenders is to use an iron,clean the crack,and sorta weld it back together. I'd maybe even try epoxy.
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Old December 16, 2017, 13:25   #3
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You can buy non-cracked L1A1 handguards pretty easily which I suspect will be a step above any type of plastic repair. Something to consider.

If it were me (and it is not, but if it were), I would contact yellowhand for some of his beautiful refinished wood furniture.

If YH is out of stock, I believe Gunplumber has some L1A1 wood that YH refinished at a fair price.

If you want to go "upscale", Flypaper makes some beautiful aftermarket wood.

If you have not already figured this out, I LOVE the look of a wood furniture L1A1. Sexy !!!
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Old December 16, 2017, 23:18   #4
Casqui1541
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Yes, Truman is close. Just made a pit stop there on the way back from Memphis tonight. Went to the Bass Pro HQ they put in the pyramid at Memphis and had some BBQ at The Rendezvous.

Just bought the plastic handguards and discovered the crack. Should have asked if there were any cracks before purchase. The rifle has beautiful original wood, but at some point, someone altered the dimensions of the insides of the handguard panels. They don't have the original contact points and fit loosely. I was wanting to use the plastic ones until I figured out how to properly restore the original wood ones. As nice as they are exterior wise and how well they match the wood buttstock, carry handle, and grip, I would hate for them to get damaged due to their current loose fit. Perhaps, I need to see if "yellowhand" can help with this. I definitely don't do wood work.
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Old December 20, 2017, 10:21   #5
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Brownell's Acraglass would be my suggestion. I have used it on many repairs from a Remy 1100 forearm split to reattaching a Marble cover to a brass hinge on a Jewelry box.
Floc can be added to strengthen or fill a crack. A fiberglass pad or strip can be used inside a handguard to provide extra strength.

You can use the Acra glass on your wood handguards by building a modeling clay dam to add material in the areas you need to build up. Once set, remove the clay and reshape to size.

Using a Soldering Iron is a good idea also if it can be done on the inside. Filling the repaired area with epoxy and sanding it flush can be done to give a better appearance if desired.
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Old December 20, 2017, 13:24   #6
lew
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I repaired an NBC synthetic handguard cracked in the same area with a generous application of JB Weld. It is holding up well.
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Old December 20, 2017, 17:26   #7
Casqui1541
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Thank you for the suggestions. They give me a starting point.
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Old December 22, 2017, 09:30   #8
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MEK?
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Old December 27, 2017, 00:12   #9
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I Was Thinking...

Any thoughts on how regular old black PVC Sewerpipe glue would work? Has anyone tried that yet?
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Old December 27, 2017, 01:08   #10
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I use plain old Testers model airplane cement, just open the windows before using.

It holds perfectly fine, got a repaired set on my STg, holds up great to heat, etc. 400 or so so rounds and all is well.

Just glue up the crack, put pressure on it to keep tight while drying, should be fine.

On your wood handguards, I can repair the insides, if all it is that the contact/guide points, front or rear are missing/damaged, do it a lot where the wood just breaks off or is worn down from 60 years of use.

I have a lot of junker sets to strip sections/pieces off of for repairs, or I just use a block of wood and remake the contours by hand on internal areas.

PM if I can help, with a couple of photos of damaged areas.
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Old December 27, 2017, 01:15   #11
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oh forgot, you can use regular old painters tape over the crack on the show side of the repair, just place it tight over the crack, then glue up the crack from the inside, by slightly twisting the crack open, then use tape or whatever to put pressure on the crack to seal it tight till glue sets.
Testors cement will melt the plastic together, the tape keeps it from leaving a mark on the outside, if done properly.
And clean, clean, and clean again, the area, last time with alcohol to remove all the old oil.
Good luck.
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Old December 27, 2017, 10:05   #12
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Isn't Testors cement MEK anyway?
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All I'm really asking for here is a knife that will not jam and a unicorn that doesn't need sharpening. Will_Power
It's been my experience that all you really need to harvest a deer is a car. They come right through the windshield just fine. 357ross
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Old December 27, 2017, 14:16   #13
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Quote:
Originally Posted by raubvogel View Post
Isn't Testors cement MEK anyway?
It might be, never looked at what its made of or with.
I'll look when I hit the shop this afternoon.

If that crack is in a high stressed area, might be prudent to use reinforcements.
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Old December 30, 2017, 17:05   #14
Casqui1541
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I tried the Testors in my model kit, but it didn't hold. However, Krazy Glue Maximum Bond has now held for almost a week with the handguards installed. Super fast dry time for it as well.
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Old January 06, 2018, 09:26   #15
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JB Weld
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Old January 06, 2018, 14:18   #16
Casqui1541
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Krazy Glue still holding after much handling and limited firing; tested to see if an indexing washer I made from a nylon coupler would withstand firing. So far, it too is holding up well.
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Old January 06, 2018, 16:03   #17
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Good thoughts mostly all here.

Best method is a plastic welding kit, might check Eastmans on that.

making it all match up can be difficult but it's what some use to assemble cut up plastic fantastic HK guns like their 36

Cracks ?
Cyronacalate/superglue
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