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How to make a female mold - 7/23/2003 6:45:30 AM   
Yellow Jacket



Posts: 140
Joined: 7/24/2002
From: Atlanta, GA, USA
Status: offline 		I'm trying to make a female mold from a positive plug.
The plug has been primed and wet sanded to a glossy finish. Next I am applying releasing wax.

Then what do I do? Spray clear coat on top of the wax, then put on a layer of laminating epoxy and fiberglass cloth until a strong mold is made?

I guess a better question is to ask the best way to insure I don't have air bubbles/pin holes in my mold.

What are the secrets?

Thanks,
Eli
       Post #: 1

mold tutorial - 7/23/2003 7:28:46 AM   
rcalfred



Posts: 391
Joined: 12/7/2001
From: Elk Grove Village, IL, USA
Status: offline 		Go to: [url]www.cstsales.com.[/url] Click on the how-to's. there is a feature on making molds including all the tips and shortcuts. Regards.


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How to make a female mold - 7/23/2003 10:51:38 AM   
rsieminski



Posts: 1406
Joined: 4/24/2002
From: Sarasota, FL, USA
Status: offline 		Check this out:
http://www.rcuniverse.com/forum/tm.asp?m=43893

The best I've seen:
http://www.nextcraft.com/fiberglassing.html


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Re: How to make a female mold - 7/23/2003 1:41:54 PM   
purge98



Posts: 79
Joined: 2/12/2003
From: Aberdeen, UNITED KINGDOM
Status: offline 		You need to apply the wax up to 5 times, with buffing in between, to get a really good release on it.
After the wax you need to paint on PVA release agent.
Once this has dried you need to mix thixotropic powder to laminating resin+hardener to form a stiff mixture, able to hold up a spatula on its own, and apply this to your plug. This will form your Gelcoat.
When the Gelcoat is almost cured you then need to apply laminating resin+hardener to it and stipple on cloth.
You then need to start building up layers to the required thickness using the above process.

Once all this has gone off - a good 24 hours - seperate the two. If this proves to be difficult you can squirt water between the two surfaces which will dissolve the PVA and make life easier.

Good luck

Jason

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How to make a female mold - 7/24/2003 2:21:32 AM   
rsieminski



Posts: 1406
Joined: 4/24/2002
From: Sarasota, FL, USA
Status: offline 		Why the "thixotropic powder"? How thick a coat?


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How to make a female mold - 7/24/2003 2:29:04 AM   
purge98



Posts: 79
Joined: 2/12/2003
From: Aberdeen, UNITED KINGDOM
Status: offline 		Thixo is used to thicken up the laminating resin so it doesn't run/sag. It makes it easier to create an even smooth layer.
Difference between thick honey and thin honey! Thick honey will stick to your toast even when updsie down but runny honey will just run off.

Jason

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How to make a female mold - 8/20/2003 1:32:21 AM   
justgeorge


 

Posts: 21
Joined: 7/3/2003
From: Cincinnati, OH, USA
Status: offline 		< How to make a female mold >

Sorry, but the obvious answer is spray water on her and leave her in a warm dark room.......

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Ka boom - 8/20/2003 4:36:01 AM   
Mike James



Posts: 2431
Joined: 1/19/2002
From: Anchorage, AK, USA
Status: offline 		Rimshot

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