Sorry, I seem to be on the wrong page.  I was talking about sculpting a male plug and
wrapping it with glass to make your duct and then removing the core from the inside of the
duct.   Sounds like you guys are trying to make a female mold for some other purpose.
Sorry 'bout that .... Jim S.


Bill Schertz wrote:

> Rusty
>  you wrote: Thanks Dave. To make the radiator ducts, I was actually thinking of
> doing this. I figure I can wrap the core in plastic, tape the mouth of a kitchen
> garbage bad around the inlet side of the core, open a hole in the bottom of the
> bag, then fill it with foam. My thought is that this will leave me with a nice ball
> of foam to be shaped. Can anyone think of a better approach?
> Thanks, Rusty (I sure won't use expanding foam from the spray cans again)
>
>
>         You can actually just tape some cardboard that is as tall as the max distance to
> the opening around the edges of the cores after you have wrapped them with plastic,
> pour in the foam material and let it expand. Your duct is always going to be smaller
> than the core as you move away from the core. the pour foam is MUCH easier to sand
> and shape than blue or pink or white styrofoam.
>
> Bill Schertz
> KIS Cruiser # 4045

--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T