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Old 31-01-2019, 03:04   #1
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How get bolts release from epoxy

I am installing G10 backing plates and going to epoxy them.

There will be bolts holding the backing plates down.

How to get the bolts to release when the epoxy hardens ?

I was thinking of coating the bolts with grease before epoxying.

Anything better ?

Release agent better than grease ?

Anti seize ?


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Old 31-01-2019, 03:07   #2
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Re: How get bolts release from epoxy

Get some mould release paste !
Steve .. It was the last one that did this !
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Old 31-01-2019, 03:43   #3
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Re: How get bolts release from epoxy

Fasteners and Hardware

When you want to install a threaded bolt or screw and be able to later remove the fastener, there are a couple easy options. In our boat building class with the Saginaw Bay Community Sailing Association, we keep a wax toilet ring for on the work bench and stick a bunch of screws in it. We just pull these out as we need them. The wax gets in the threads and we can back the screw out easily after the epoxy has cured. You can also put auto paste wax on a piece of cheesecloth, grab the threads firmly below the head and back it out with a cordless drill in reverse. This applies a nice thin coat of wax evenly over the entire thread pattern.

Pam® Cooking Spray is a quick and convenient adhesion preventer. Simply place the fastener on a paper towel and spray the threads, butter the threads with a bit of thickened epoxy so air isn’t trapped, push the fastener into the oversized, partially filled hole and let the epoxy cure. Back it out after the epoxy hardens and now you’ve cast threads in the epoxy.

Polyvinyl alcohol or PVA is a green liquid available at hobby shops and craft shops. Dip the fastener in or brush it on the threads, let it air dry and install the fastener like I just described for Pam.

There are a number of aerosol mold release sprays on the market. A couple we’ve used around the tech shop are Stoner® E-497 and E-499 Thermoset Mold Release. They work well for all thermoset resin systems used in most boats – epoxy, polyester and vinyl ester. They do not contain any silicone, which you want to avoid in any mold release, especially a spray. Silicone aerosol sprays can contaminate the entire shop if you’re not careful.

From WEST SYSTEM® “EpoxyWorks” ☞
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Old 31-01-2019, 08:20   #4

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Re: How get bolts release from epoxy
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Old 31-01-2019, 08:47   #5
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Re: How get bolts release from epoxy

WAX works fine.
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Old 31-01-2019, 09:13   #6
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Re: How get bolts release from epoxy

I’ve used PAM spray when I wanted machine screw (not bolt) threads in epoxy so that the screws could be removed and replaced numerous times. Breaker panel on my C&C, not structural.
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Old 31-01-2019, 11:07   #7
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Re: How get bolts release from epoxy

Best mold release waxes are Bees wax blended with carnauba wax. Naptha is the solvent. I use
Honey wax By Stoner molding Solutions.
1070 Robert Fulton Highway.
Quarryville, PA.17466.
ph +1 (727)786 7355.

If you forget to apply release agent to a SS Steel screw. I think probably will windout anyway there's many materials that Epoxy resin will not stick to.

However rest an electric soldering iron on the screw head for few minutes and then apply torque with a screwdriver. Or other appropriate tool.
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epoxy, lease

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