Fiberglass release agent for bolt threads. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-29-2011, 04:08 PM
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Fiberglass release agent for bolt threads.

I want to experiment with some "alternative" gear shift knobs. I intend to fill hollow objects with resin and insert a bolt to match the threads on the shift lever before the resin sets up. Hopefully I can then simply remove the dummy bolt after the resin hardens and the knob will thread right onto the shift lever.

But I'm wondering what to use for a "shadetree" release agent. I'm thinking WD40, PAM cooking spray, or Vaseline. I'm concerned that tin foil or other "wraps" will create too many imperfections and the threads won't turn out smooth enough. Also paste wax might be too difficult to completely get into the threads.

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Old 04-29-2011, 04:26 PM
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Thier are threaded inserts available,[threaded inside,knurled outside] I believe that's the way I'd go. Ithink you'll have a devil of a time getting any sort of " release agent" on consistantly enough to get good threads. also you could put a rod the desired dia. in your mold, then remove and tap. Just a thought.

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Old 04-29-2011, 04:49 PM
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try a t-nut made for wood, i'd use paste wax to make sure you could turn it out. use a stiff brush to apply it and to remove excess
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Old 04-29-2011, 04:58 PM
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I think the insert would be the best route....or just drill and tap a hole after
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Old 04-29-2011, 08:53 PM
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I agree with the threaded insert idea.

Or you might try wrapping the bolt
threads using Saran Wrap or teflon tape.
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Old 04-29-2011, 09:10 PM
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I really don't think it will work... The resin by it self isn't very strong... If you try to drill and tap it.. It would most likely crack... If you try glassing around the bolt,, The min you try backing it out,, The little threads will crack.... Something big might stay together,, But glass as small as a thread... I really don't see it not cracking... The insert would be the way I would go...I see that working for sure... Good luck cboy.. I know you will come up with something very cool... I would make a custom one in a lathe... Out of alum.. With some brass inserts pressed in it... You can get very creative on a lathe..
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Old 04-30-2011, 11:41 AM
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maybe a cheaper way to do it, would be just screw a nut onto a bolt and use the nut for the threaded insert.
if this is just a low budget, fooling around, project.
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Old 04-30-2011, 03:37 PM
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Thanks to everyone for the tips and advice. I'll have to do some experimenting.
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Old 04-30-2011, 05:01 PM
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Just use paste floor wax. Will work fine.
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Old 05-04-2011, 04:16 PM
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+ paste wax!
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Old 05-15-2011, 09:03 AM
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Try lip balm such as Blistex
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Old 05-15-2011, 04:21 PM
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Try lip balm such as Blistex
Or good ole anti-seize
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Old 05-15-2011, 05:42 PM
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Glass a nut in the knob
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