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Is it possible to seam/paint week old silicone?

Hi, I cast a piece in ecoflex 30 last week and had serveral failed attempts at seaming possibly due to "latex free" sponges (used to texture) contaminating my work, plus the patch that did set up did not stick. I had cleaned it thoroughly  with acetone. Now a week has passed. Is it possible to clean with alcohol or some other substance and have my seam and paint stick or do I need to start all over since the 72 hr cure window closed?

Question 2: is there a tutorial on silicone seaming? I can't find one. Any help is much appreciated!

Best Answer

  • Chris EllerbyChris Ellerby Los Angeles Admin
    Accepted Answer
    Hi Paul,

    seaming older silicone can be tricky.  You may be able to clean the surface with a more aggressive solvent like Smooth-On's NOVOCS or Naptha to soften it up a bit and get a better bond.

    We don't have a class that focuses specifically on the seaming process.  We should cover that process in more depth in a future lesson.


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