Puddles in foam latex?

Daniel SchmittDaniel Schmitt ✭
in Lab work
Hi! I'm having a problem with Monster Maker's foam latex. After baking, it looks to me as if a huge flat air bubble or water puddle was trapped inside. But that can't be the case, since I always apply the foam latex with a brush into the recesses and undercuts first before pouring in the rest. The spot isn’t really a recess either. Also, during the second foam run, I noticed that the plaster mold was damp in that spot. Maybe the attached photo explains it better. Also this has happened three times now. 
Does anyone have any idea what happened there and how I can prevent it?


Answers

  • Chris EllerbyChris Ellerby Admin
    Looks like you had steam build up, which is a common problem with foam latex.  You mentioned you were using stone molds.  Are those somewhat fresh, or have they had the moisture pre-baked out of them?  

    Make sure your foam fully gels before baking, as steam can easily push around ungelled foam.

    You can also help prevent steam buildup by baking at a lower temperature for longer.

    If you've fully dried your mold, baking at a lower temperature for longer does not help, and you find steam building up in the same spots in the mold, you can drill some fine bleeder holes to let the trapped steam escape.

    /Chris
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