Plaster of Paris
05-06-2009 | 07:16 AM
#2
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From: Akron,
OH
RE: Plaster of Paris
I've used it for small parts, Wax paper is fine for the parting surface, haven't tried it of a fiberglass part.
You will have to dry the plaster after you release your plug. I put it in the over at about 150 degrees for 4 hours. On a larger mold it may take more time.
Hope thats helps some.
You will have to dry the plaster after you release your plug. I put it in the over at about 150 degrees for 4 hours. On a larger mold it may take more time.
Hope thats helps some.
05-06-2009 | 07:53 AM
#3
RE: Plaster of Paris
rcpete,
I make most of my molds out of styrofoam (blue preferred). You can see some of my construction on my personal web site http://gates-sid.com (go to models and F-94C)
For parting on larger molds I use Johnson's wax and one coat of Partall. For some very small ones I use the packing film which will stretch around corners and is very thin.
I make most of my molds out of styrofoam (blue preferred). You can see some of my construction on my personal web site http://gates-sid.com (go to models and F-94C)
For parting on larger molds I use Johnson's wax and one coat of Partall. For some very small ones I use the packing film which will stretch around corners and is very thin.
05-06-2009 | 09:08 AM
#4
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RE: Plaster of Paris
I have used Hydrocal 30 with success for quick molds. Mixes with water etc. Any local boat repair/ supply store such as west marine will sell "release agent". Wax paper could give you unwanted creases. The release agent will be near their epoxy's.
05-06-2009 | 11:02 AM
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From: SeaTac - Angle Lake, WA
RE: Plaster of Paris
ORIGINAL: sidgates
rcpete,
I make most of my molds out of styrofoam (blue preferred). You can see some of my construction on my personal web site http://gates-sid.com (go to models and F-94C)
For parting on larger molds I use Johnson's wax and one coat of Partall. For some very small ones I use the packing film which will stretch around corners and is very thin.
rcpete,
I make most of my molds out of styrofoam (blue preferred). You can see some of my construction on my personal web site http://gates-sid.com (go to models and F-94C)
For parting on larger molds I use Johnson's wax and one coat of Partall. For some very small ones I use the packing film which will stretch around corners and is very thin.
Nicely done Sid... For those who've not taken a look, navigate to this page: http://gates-sid.com/HOBBIES/F-94C/F94C%20PROJECT.htm
Cheers,
05-06-2009 | 11:33 AM
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From: Scottsdale, AZ
RE: Plaster of Paris
I have used superfine casting plaster to make molds for pulling canopies on a vacuum former, but not for fiberglass molds. Be careful, the plaster is pretty porous and it will be tough to protect it from the resin. Wax paper will work for flat surfaces but not really for compound curves.
05-06-2009 | 12:25 PM
#7
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RE: Plaster of Paris
ORIGINAL: rcpete347
HI all, I am going to make some moulds, to duplicate some parts, would Plaster of Paris be too hot for Fiberglass .On a large surface, would wax paper be good enough for a release agent, or is their some thing else.
Rcpete
HI all, I am going to make some moulds, to duplicate some parts, would Plaster of Paris be too hot for Fiberglass .On a large surface, would wax paper be good enough for a release agent, or is their some thing else.
Rcpete
