Layering polyurethane resin

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    • #2011
      Katherine Swift
      Guest

      This question comes through email by TJ:

      Im wondering about layering polyurethane resin for doll application. 
      Typically, a doll would be casted in the resin and then painted with acrylic paint to recreate skin effects such as blushing and veins.
      Is it possible that the blushing can be achieved with light layering of thinned tinted resin? Should the casted doll only be allowed to cure maybe halfway?

    • #2012
      Katherine Swift
      Guest

      Could this be done?  Yes, but Im not sure it is the easiest way to go about this.

      First, I would have concerns about getting the resin to stay in one place on a curved surface.  If I was going to try, I would use a very quick curing polyurethane resin.

      Secondly, assuming you could get it to stay in one place, I would suspect that the cheeks would look raised, e.g. not on the same plane as the rest of her face.

      Since you are most likely pouring your resin into a mold, you wont be able to get to the cheek area while it is wet enough to pick up color without making a mess of what you just poured. 

      Unfortunately, using acrylic paint is probably your easiest bet.

    • #2013
      TT
      Guest

       Well, heres how it works in my head. 

      Id cast the doll as usual, then before it cures all the way, Id quickly dab on some tinted transparent resin as the blushing. I didnt think about it looking raised… I can use a solvent of some kind to thin it down couldnt I?
    • #2014
      Katherine Swift
      Guest

      Two concerns:

      1.  How are you going to get the doll head out of the mold before it is completely cured?

      2.  Polyurethane resins are very fussy.  You are not going to be able to thin it out with a solvent and have it still cure.  Even if you could, I would worry that you would see a line where the second layer intersected the first.

    • #2015
      TT
      Guest

       Well, heres how it works in my head. 

      Id cast the doll as usual, then before it cures all the way, Id quickly dab on some tinted transparent resin as the blushing. I didnt think about it looking raised… I can use a solvent of some kind to thin it down couldnt I?
    • #2016
      TT
      Guest

       Sorry about the double post. Yeah, that idea is scrap. What about… um… painting the mold itself with blush, letting that mostly cure, then putting the 2 halves together  (if its a 2part mold) to fill in the rest of the resin?

    • #2017
      TT
      Guest

       Sorry about the double post. Yeah, that idea is scrap. What about… um… painting the mold itself with blush, letting that mostly cure, then putting the 2 halves together  (if its a 2part mold) to fill in the rest of the resin?

    • #2018
      TT
      Guest

       Sorry about the double post. Yeah, that idea is scrap. What about… um… painting the mold itself with blush, letting that mostly cure, then putting the 2 halves together  (if its a 2part mold) to fill in the rest of the resin?

    • #2019
      Katherine Swift
      Guest

      You could try brushing the colorant on first.  I have had success with that and epoxy resin, but have never tried it with polyurethane resin.

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