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01/23/2012 - Updated 05:13 PM 
         


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Plastic Resin Casting and Molding  - How-to Guide

I've decided to put together a basic "how-to" guide that covers rubber mold making and resin plastic casting and molding.  I learned quite a bit over the last 5 years while building my B9 Robot and a couple dozen Mystic Seers'.  This is will not cover plastic injection molding but rather the type of molding you can do at home

Hopefully you will pick up a few tips here that will help you avoid some of the pitfalls.   If you haven't already, you should first check out my Silicone Rubber Mold Making - How-to Guide.

When molding parts, I use a 2 part resin called Por-A Kast "Mark-2".  I have also used Smooth-On's "Smooth Cast 300" series (300, 321 &  326) with great success.  You measure it out by volume so it is pretty easy to use.  It's also pretty forgiving if your ratio is off a little. 

Here's a link to the Smooth-On Plastic at Amazon------------------------------>

 
If you want your resin part to have a specific color you will have to experiment with some coloring.  I use So-Strong colorants.  There are very strong and very reliable once you figure out how much to use.  To get the desired pink-flesh tone I have to mix a drop of orange with a drop of red.  That is enough to tint about 4 ounces of resin.  I mix up a small batch of the Part A of the resin and keep it in an air tight container.

If you want a kit w/both Silicone and Plastic, here's what you want.------->

 

 
If you want to extend the life of your molds you'll want to have to spray on mold release.  Lightly spray both halves of your mold and let it dry a few minutes.
Measure out an appropriate amount of Part A and Part B.
Combine the two parts.  I pour them back and forth a few times to make sure I get it all mixed.  They say you should pour both parts into a third container.  Sometimes I do and sometimes I don't.  As long as you thoroughly mix it up, you should not have any problems.
  Continued on Plastic Resin Casting Page 2

     

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