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February 4
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Doll Molds {WIP} by DonnKinney Doll Molds {WIP} by DonnKinney

Just look at them in their bubble gum pink splendor. :-)

A full set of Silicone molds for an 18/17 inch doll, I just finished these for a client and I will be doing his casting work as well.  Aside from the casting/molding work for my own dolls i also do the molds/casts for a few other artists.

I was hoping to have these finisehd a few weeks back but the insanely cold weather slowed the work down considerably. Silicone doesn’t take well to cold and it sloooows down the mold making process to a crawl.

aside from a little cleaning these are finally done! :-)

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briescha 5 days ago  Professional General Artist
Just creepin' this post again. Staring in terror as I get ready to do my first full production molds. Analyzing your techniques. ;) Aaaand... chickening out and starting a junk cast of my boy's head first. Only I'm pressure casting for the first time. I think you said before that you vaccuum cast? If so, do you think the way you do the sprue and vents would work the same for pressure casting? Fear is clouding my physics knowledge now! :)
DonnKinney 5 days ago  Professional General Artist
 Don't worry you can do it :-) and if it doesn't work out you'll have learned something, the important part is to keep at it (remember ive been working with resin and silicone since 88/89 so Ive had a loooooooot of time to trial and error) 99.9% of any info out there is geared toward casting something thats a prototype or a model kit that's going to be painted, casting slightly translucent resin parts with a nice matte bubble free finish is something i had to figure out by screwing up 1000 times, haha. ;D

 I actually pressure cast, its the ONLY way to get perfect casts.. I do however de-gass my mixed silicone in a vacuum chamber before i pour my molds because if there are any trapped bubbles/air pockets in your silicone molds when you pressure cast them the trapped bubbles will collapse and deform your mold.. your finished part will look like it has the hives :-( if you used one of those super low viscosity silicones this might not be a problem though, its something i always do as a rule :-) And yes sprues will totally work pressure casting, all my tiny slim parts like arms and legs i cast with one main sprue breaking off into many tiny ones to fill and vent the parts properly but regardless,.. YOU CAN DO IT! :D
briescha 4 days ago  Professional General Artist
Then I'll go forth trying not to give my dolls the hives! :D Thanks so much for your help. I'll let you know how it goes. ;)
That is so very cool!!! How long do they last? one time use or many? I am not good at these types of things XD
DonnKinney Feb 6, 2014  Professional General Artist
Mold max 30 Silicone molds usually last (in good shape and using the methods i use to get super matte casts) for about 35-45casts (they begin to degrade around 35), the larger the part the more heat generated and the faster the mold degrades so for smaller molds you can often get more casts before the mold degrades.
Impressive ! It makes me realize how tricky it is ...
DonnKinney Feb 6, 2014  Professional General Artist
thanks, there is a lot of work involved :-)
Frodomeg Feb 5, 2014  Hobbyist General Artist
How much silicone was required to do all of these pieces?
DonnKinney Feb 6, 2014  Professional General Artist
you are looking at just a little under 2 gallons,.. probably something like a gallon and 3/4
ToySkunk Feb 5, 2014  Professional General Artist
Interesting, it is very exciting to see this part of the process! I want to try casting some resin from home-made silicone molds sometime so it is fascinating to see your process. :thumbsup: I assume all of the bibbly bobbles are to hold the two sections together... but how on earth do you create that aspect of the mold?
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