Possibly an old subject but...ridding a urethane rubber surface of gloss/shine to get a "matte" finish

Does anyone know how you can remove/get rid of the glossyness/shine of a urethane rubber casting?I know that silicone you can use a dulling/matte powder that you dust onto a tacky surface when painting a final coat onto it and then you wash it off and "ta da"!You have a matte surface,but I don't now if you can do the same thing with urethane rubber.I'm kind of torn between using silicone or urethane to cast puppets from.I also know very lite/fine sanding can be done,but if a puppet has allot of surface detail,I'm not sure that will work very well,or be the best means of achieving a matte finish?So,I'm just putting my feelers out to see what anyone else has to say,or if anyone tried it or some other method that yielded good results.

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Ron Cole would know, he's cast a few puppets in silicone.  It depends on what you can paint it with.  With latex (either foam latex, or liquid latex skins) I use acrylic paint and Pros-Aide which does add some gloss, but I dust it with talcum powder to take away the stickiness and gloss.  I think you can paint urethane with that as well.  

I have certainly used water based acrylic paint of cast urethane foam, I haven't ever cast a skin is solid urethane rubber but I think it would be the same.

There is also a clear Matte Medium for painting over acrylic paints, at art stores.  A light spray of that should help.

With Platsil silicone, I have used the matting powder dusted over the final coat while it is still wet, and that does work for silicone.  I think it depends on the powder - mostly icing sugar I think - being water soluable, while the silicone is not, so it washes out and leaves the microscopic little pits behind. With a water based coating, I think the matting powder would just dissolve in, and become part of the coating when it dries. 

Well,I know the Puppets Ron made for his "Fall of Gravity" were cast out of urethane,but I don't know how,or what he did to get rid of the glossy shine,or if there even was one?There's lots of urethane rtv rubber out there,many formulated different,but all the same (more or less) after its all said and done.

Just been thinking - something so obvious I didn't even think of it yesterday.
Liquid latex is glossy if you dab it onto something, but it is not glossy when you cast it in a plaster mould. It is on the inside of the skin, but not on the outside where it was formed on the plaster surface. Same with silicone, it doesn't come out of the mould glossy. It's probably the same with urethane.
So if you paint it with matte acrylic with only a small amount of pros-aide, it won't be very glossy anyway. That's what I would try first. Then I would dust it with talc.
Ron seems to be on FB more than he is here, these days. And he just gave notice that he won't be there much for the next couple of weeks while he does a paying job.

Problem solved Nick,I think I'm going with Dragon Skin silicone,seems to be the "best" bet.They have a solvent that turns the silicone "matte",but of course,there are many ways to skin a cat as Ron would say.

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