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RTV Silicon casting

Discussion in 'Molding and Casting' started by RichMO, Mar 12, 2016.

  1. RichMO

    RichMO Well-Known Member

    Thought I was heading in the right direction but ..... proved me wrong. I was going to do a simple casting of scales on a fish using silicon out of the tube. I purchased GE 100% Silicon and mixed in a dab of Acrylic paint and it never did set up? Then I mixed in a little glycerin and that did not help. I thought the last time I did this all I used was the paint and it set up in about 15 min.? Where am I going wrong?
  2. Steve.J

    Steve.J Member

    Are you using Silicone I or Silicone II ?

    I have found that there is something different in the Silicone II that will not allow it to setup well when paint is added.

  3. RichMO

    RichMO Well-Known Member

    Steve, the tube says Silicon II

    Think I found the answer.... I'm taking the Silicon II tubes back and getting the Silicon I. Everyone talks about the smell and I know its the acetic acid. Maybe this will help others.

    The one difference between GE I and II besides binding properties is the way they cure. GE I cures via acetic acid and GE II via ammonia.
  4. RichMO

    RichMO Well-Known Member

    Re: RTV Silicon casting (UP Date)

    Up Date...... I just finished up using the GE Silicon (I) and it worked and acted just like it's supposed to.....taaaa daaaa. This confirms that "Do Not Buy GE Silicon II. I also checked the tube and it did cure with Acetic Acid NOT Ammonia.
  5. Van dykes restorers sells rtv rubber product also that is 2 parts, it's green. it works great for molding scales.
  6. Eaglewood

    Eaglewood New Member

    contact me for the right stuff to use-- I am a distributor for many different molding products. 8103580209 CLay