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Old Aug 13, 2011, 10:55 AM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
577 Posts
Cool
Forton MG (Plaster/Acrylic Polymer) as a mold material..

Hi all,
We are building a DLG wing and fuz mold using a material called Forton MG. It is a Plaster/Acrylic Polymer (not mixed with water) and is available from Barnes Products. The trial mould we have made looks fantastic and it is strong, rock hard, stable and the surface finish is like an Epoxy mould - super smooth and shiny! The best thing is that is quick and easy.

Our DLG thread with some more info is in the Hand Launch section here...
http://www.rcgroups.com/forums/showt...7#post19034630

Has anyone else used a Plaster/Arcrylic Polymer for making molds?
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Last edited by Machineman; Aug 15, 2011 at 07:57 PM.
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Old Aug 13, 2011, 11:39 AM
agnotology
kcaldwel's Avatar
Joined Jan 2007
3,655 Posts
I think it is the Forton MG process, not MD:

http://www.artmolds.com/gateway/technique/forton_1.htm

Kevin

Edit:

US suppliers:

http://www.sculpturedepot.net/clay-w...ls/casting.htm

http://www.pinkhouse.com/Forton.html
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Old Aug 13, 2011, 08:14 PM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
577 Posts
Thanks, fixed...
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Old Aug 14, 2011, 06:45 AM
I hate propellors
emufingers's Avatar
Australia, SA, Normanville
Joined May 2009
383 Posts
Quote:
Originally Posted by Machineman View Post
Hi all,
We are building a DLG wing and fuz mold using a material called Forton MG. It is a Plaster/Acrylic Polymer (not mixed with water) and is available from Barnes Products. The trial mould we have made looks fantastic and it is strong, rock hard, stable and the surface finish is like an Epoxy mould - super smooth and shiny! The best thing is that is quick and easy.
What are you using to seal the mould surface and what release agent for epoxy fuz?
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Old Aug 15, 2011, 08:55 AM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
577 Posts
We don't need to seal the surface of the Forton mold as the finish is already smooth and shiny like an Epoxy mold.
I use a normal Epoxy wax (Canabra) on the plug and they release really easily. I have never used PVA (never needed to).
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Old Aug 15, 2011, 10:28 AM
Registered User
Joined Dec 2006
1,441 Posts
look great! did you add any additives like cabosil to thicken the mixture? also, do you think adding graphite powder like in the epoxy molds would help here?

thanks!
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Old Aug 15, 2011, 07:04 PM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
577 Posts
Hi,
No additives. We mixed the two parts together as per the instructions and poured it on. It has a natural thickness and stickiness already.
One thing to do once you have poured in the first coat is to run a stick around the corners of the plug to eliminate any air bubbles.
No idea on the Graphite powder, might be worth experimenting with.
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Old Aug 15, 2011, 10:52 PM
Thermal Wrangler
DrFragnasty's Avatar
Launceston Tasmania
Joined Mar 2004
2,127 Posts
On the Forton bandwagon

Molded up a bee-sting (it's a tail-cone) for my Estrella.

Tried Forton which worked well bar a few bubbles (it needs more "kneading" while laying it up) but I molded it wrongly because it didn't have an "opening".

Rushed home at lunch today and feeling brave I started a cut with a hacksaw then finished it off with a bandsaw.

A bit of sanding and it's fixed.

It didn't chip during the process. This is looking promising.

Chris.
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Old Aug 16, 2011, 03:31 AM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
577 Posts
Chris (from planet Forton),
Looks good, well done!
The fact that it did not chip is indeed very promising!

Also, I spoke to the Barnes technical team about adding the Aluminium powder that you used and they said not to use it. 1. The material is already very hard, 2. The Aluminuim does not emusify with the water based Acrylic Polymer properly and 3. They said the Aluminium can be explosive in the water based Acrylic Polymer.

Worth giving a miss on the next mould.

Cheers,
Marcus
(fellow Fortonian)
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Old Aug 16, 2011, 08:49 AM
working to the closest cm
jirvin_4505's Avatar
brisbane australia
Joined Nov 2002
2,127 Posts
Quote:
Originally Posted by DrFragnasty View Post
Molded up a bee-sting (it's a tail-cone) for my Estrella.

Tried Forton which worked well bar a few bubbles (it needs more "kneading" while laying it up) but I molded it wrongly because it didn't have an "opening".

Rushed home at lunch today and feeling brave I started a cut with a hacksaw then finished it off with a bandsaw.

A bit of sanding and it's fixed.

It didn't chip during the process. This is looking promising.

Chris.
nice work Chris

Have you had a play with the alternate (pva+plaster) you listed in the DLG thread?

cheers jeff
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Old Aug 16, 2011, 11:48 AM
Thermal Wrangler
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Launceston Tasmania
Joined Mar 2004
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Hi Jeff, not yet. I'll wait until the Forton Acrylic - Poly liquid runs out then give it a go.
Chris.
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Old Aug 16, 2011, 11:55 AM
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United States, GA, Roswell
Joined Mar 2008
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Compatibility

Is Forton compatible with Frecote 770
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Old Aug 16, 2011, 07:00 PM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
577 Posts
I assume so and don't see why not.
I use my current PLP 10 wax on every different surface I have ever moulded from: epoxy, timber, glass, malamine, plaster, Forton, steel, PU, so it should be OK. also, plaster is not really a glue (like epoxy) that wants to stick to anything, so I have pulled plasters from surfaces with no wax.

If in doubt do a small trial piece.

Cheers,
Marcus
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Old Aug 17, 2011, 08:06 AM
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United States, GA, Roswell
Joined Mar 2008
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Parts

Can someone share in their personal experinece in using these molds. Maybe some part pictures. I see a bunch of achitectural and live casting but mo plane parts??????????
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Old Aug 17, 2011, 08:46 AM
Thermal Wrangler
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Launceston Tasmania
Joined Mar 2004
2,127 Posts
Just finished waxing 5x, painted and drying ready for a test lay-up...you can't rush this ;0)
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