Mold/pattern release material

[Stepside]

I need some ideas for a release material to use between a steel plug and JB Weld. I want a close fit when the plug is removed and the part is inserted.

Thanks in advance

Pete

[RichR]

Use the directions on the JB Weld tube as a guide. If it reads:

Surface must be free of oil, grease, wax, dirt and dust.

then try using one of those.

[boslab]

Silicone mould release, dry ptfe, soap, washing liquid, Vaseline, just a few.
Mark
Completely summed up already lol

[Highpower]

PAM cooking spray. Works as an anti-spatter spray for welding too.

This works good too.

[38_Cal]

The acraglas release product is an alcohol based vinyl product that, when dry, has a measurable thickness, and when your epoxy is cured can be scraped off of both the epoxy and what it's been painted onto. At one time they had an aerosol PTFE release agent that worked well when you remembered to shake the can well...not so well when you forgot!

[Beazld]

carnauba wax without grit, PVA (poly vinyl alcohol)

[polaraligned]

As stated above, PVA and/or wax. Both are used as release films for making composites with epoxy.

[darryl]

While there are many things that will work, I prefer PVA. It does have a thickness, which allows for some flex when you are trying to separate the parts- not much, but more than the silicone or teflon coatings.

I very often have used a simple, easy to find mold release- you actually carry it with you at all times, even when you're completely naked- it's hair oil. I'll rub a finger just above my forehead and into the hair, or behind my ears, then transfer that to the mold. Two applications usually do the trick. People have laughed at me for doing that, but I have the last laugh. It does work, try it.

[danlb]

SInce we are talking about a specific product, I found this on https://www.jbweld.com/pages/faqs

1) J-B Weld will not adhere or bond well to:

Any flexible rubber surface
Leather
Vinyl
Canvas
Polypropylene plastic
Polyethylene plastic


2a) What can I use as a surface cleaner before using J-B Weld?
We recommend using acetone or lacquer thinner. In the absence of these two, soap and water can be used. Just be sure that the surface is completely dry before applying J-B Weld. DO NOT use alcohol or any “cleaner” that will leave a petroleum residue.
2b) Is J-B Weld resistant to water and/or gasoline?
When fully cured, J-B Weld is completely resistant to water, gasoline, and about every other petroleum product or automotive chemical.

Which suggests that an oil will work without impacting the cured product.

Dan

[epanzella]

The go-to release agent when glass bedding rifle stocks is KIWI neutral shoe polish. I've used it many times on custom rifles. It releases easily and has negligible thickness.

[darryl]

I forgot about shoe polish- that does work also.

[flylo]

Renaissance Wax works well as it goes on so very thin.