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HomeScaleAircraftHelicopterScale Model RC Helicopters › Materials for Mold and Plug
02-09-2006 06:28 PM  12 years agoPost 1
DR YEN

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Arcadia, CA

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I don't think I am quite ready for Scale Modeling yet but I do want to make a new canopy for my TREX.

I've been thinking about creating a fiberglass canopy from a mold but I have no idea what are the best materials and easy to use.

I checked out http://www.fibreglast.com and the foam seems to be very pricy.

Are there any cheaper alternatives for a mold that would work just as well?

I want to make a female cavity of the mold to get the smoothest finish, but it seems difficult to fiberglass from the inside? Any tricks or tips to achieve this?


THANKS,


DR YEN

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02-09-2006 06:58 PM  12 years agoPost 2
flybarless

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Torrington, CT

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for a small plug like that, I would carve it out of piece of white foam, I use multiple layers of 1/2" laid up as thick as I need. Glue the layers with tinted elmers kids glue, the lines make great "guides" to keep things even.

once your happy, wax heavily and evenly(a hair drier helps) it will fill the pores in the foam, with butchers floor wax and drop it some plaster of paris, do it in 2 halfs and then trim and join the halves.

Just remember -- if the world didn't suck, we would fall off.

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02-09-2006 08:48 PM  12 years agoPost 3
DR YEN

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Arcadia, CA

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flybarless: for a small plug like that, I would carve it out of piece of white foam,
Hey flybarless,

What kind of foam are you referring to? High Density Insulation Foam? Where can I get some? Any suggestions for the female cavity mold?

Thanks for your reply,


DR YEN

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02-10-2006 03:55 AM  12 years agoPost 4
ESWLFSE

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Liberty Hill, TX

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If you're just making one part you can use the green floral bouquet foam stuff. Glass over it then just remove it all from behind later.

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02-10-2006 05:07 AM  12 years agoPost 5
flybarless

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Torrington, CT

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I get foam at the builders supply, most of the time they save broken sheets for me, I never need huge pieces.

I either get the blue stuff or the white bead stuff. For small plugs it really doesn't matter.

Plaster of paris is available at craft stores, mix with water, set your plug in, pop it out and start laying in glass.

If you want your female halves to last, keep the plaster at least 3/4" think minimum and lay in a little guaze in the bottom, it will strengthen the mold.

Just remember -- if the world didn't suck, we would fall off.

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02-10-2006 07:39 AM  12 years agoPost 6
DR YEN

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Arcadia, CA

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Altimat: If you're just making one part you can use the green floral bouquet foam stuff. Glass over it then just remove it all from behind later.
Should I use some type of liquid latex or a ooating over the green floral foam? I would imagine that the Resin would soak into that kind of stuff fairly easily, therefore making it difficult to remove in the end.
flybarless: Plaster of paris is available at craft stores, mix with water, set your plug in, pop it out and start laying in glass.
And for the Plaster of paris mold, I could fiberglass directly on the plaster? Or would I also need to spray on some sort of Mold Release agent?

I actually went over to Michael's Arts and Crafts store today and I was looking at the Plaster of Paris, Green Floral foam, and a MOLD RELEASE for candles. I wonder if the Mold Release for Candle making would suffice? It was about $10 a can though, very expensive to try if it doesn't even work in the end.

THANKS for all the info, I think all there left for me to do is experiment. But I'm definately open to more tips and suggestions.

DR YEN

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02-10-2006 01:18 PM  12 years agoPost 7
ESWLFSE

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Liberty Hill, TX

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If you wetted your fiberglass off the foam without any excess resin and then laid it on I don't think it would soak in much, but you could seal it too. The green foam is the only foam polyester resin won't melt besides the super-expensive urethane foams. I think it would be fairly easy to scrape out and sand smooth from behind.

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02-10-2006 01:49 PM  12 years agoPost 8
Doug

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Port Saint Luice Florida....

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If you use any polyester resin in you mold, it will take weeks (month's) to cure to the point of not sticking to the finished product. Plaster of paris is hard to beat for low volume mold making. I would use a two step (Plug mold). Plaster will mold on the plug and transfer the finnish quality with little effort.

First member of Member of Bearings Anonymous

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