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is loctite ok for a screw that screws into plastic

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is loctite ok for a screw that screws into plastic

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Old 04-07-2011, 07:56 PM
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I have used blue and red loctite on my slash screws that go into plastic with no damage to the plastic. The red does work better on the plastic than the blue but I ran out so blue has been doing the job for now. Besides even if it does damage the plastic in some way its no big deal because the reason the screw is backing out is the plastic is stripped so its already damaged and in need of replacement.
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Old 04-07-2011, 08:12 PM
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i use all blue loc on metal and ca for plastic simple
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Old 08-12-2019, 07:48 AM
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Default Threadlocker safe for plastic

Hi, I'm having a hard time with the thread locker, my screws goes into a metalic nuts, but this metalic nuts are hold by plastic, I've used 2 theadlocker (permatex screw glue it says multi-material) and a vibra tite and the problem I have seems to lock the screw but the plastic arround the nut gets weaker and them the screw comes out with the nuts.

Do you know any threadlocker safe for plastic?
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Old 08-12-2019, 08:22 AM
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You need to replace the locking nuts with new ones. Plastic inside only lasts so long. Locktite is really made for metals.
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Old 08-12-2019, 08:44 AM
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Use nail polish.
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Old 08-12-2019, 11:10 AM
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Put a small drop of ca glue on the tip of a small hex wrench and dip it into the hole in the arm then swirl it around the edges. Make sure it doesn't fill in the hole, just a light film of ca around the hole. Let everything dry then reinstall. Itll almost feel like tapping into new plastic.
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Old 08-12-2019, 11:18 AM
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You can use thread lock RED … but as said Id replace the nut 1st.. then last thing if that fails use red thread loc
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Old 08-12-2019, 11:25 AM
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Originally Posted by periquita View Post
Hi, I'm having a hard time with the thread locker, my screws goes into a metalic nuts, but this metalic nuts are hold by plastic, I've used 2 theadlocker (permatex screw glue it says multi-material) and a vibra tite and the problem I have seems to lock the screw but the plastic arround the nut gets weaker and them the screw comes out with the nuts.

Do you know any threadlocker safe for plastic?
Do you have an example of the vehicle and which part you're trying to do this? It sounds like the nuts fit into molded plastic parts that hold them in place, but the nuts are now spinning.

From what you are saying, I think the solution is to use locknuts instead of plain metal ones. The nylon in the locknuts will hold the screws and keep them from turning, and you will not need to use threadlocker at all.
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Old 08-12-2019, 04:48 PM
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I put a little bit of ca glue in hole and let it dry before installing hardware.
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Old 08-12-2019, 05:42 PM
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Methacrylate is an electrochemical reaction with metal more or less the stainless steel, high carbon steel, hardened steel. Methacrylate doesn’t react with most plastics, however Methacrylate can become extremely brittle.
I don’t see where Methacrylate will make plastics brittle and effects are almost the same as cyanoacrylate, both are acrylics.
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