2 years ago#1
Guest
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Hello, I want to make a master positive of a Ultra-cal plaster mold using Smooth-on Mold Max 30 Silicone. They suggested sealing it with Super seal and then applying Ease Release to the plaster. Do you think this will work ? Do you think I will be able to clean the original Mold ?

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2 years ago#2
ZOMBIE7666
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Definitley, Silicone won't bond to ultracal and vise versa...
The mold release will make it easier I suppose but I won't even say it's necessary
good luck!

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2 years ago#3
JD
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Thanks, do you think I will have a problem making more plaster molds from the silicone master ? ..the plaster staying in place when applied to the silicone master.

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2 years ago#4
ZOMBIE7666
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thats tricky but it could be done...
do you have any pictures of your project? that'd help greatly.
Personally I'd mist the silicone with a little clear coat then dust it with baby powder in hopes of adding a little surface tension for the plaster to grip. On that note though I'm not sure what your trying to cast so I can't say for sure if that'd work

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2 years ago#5
Klown King
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No pics, im just now sculpting.. I think i will go another way then. The only way that will work is if i have enough to fill the entire cavity. And then like you said, gravity would not allow me to make production molds from the master.

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2 years ago#6
ZOMBIE7666
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ahhh.... didnt realize it was you... if ya wanna know how to make a master from a latex mask check here http://www.morningsidesanitarium.com/index.php?option=com_content&view=article&id=54:urethane- masters&catid=38&Itemid=60

you can also do it by simply poring a really thick cast and then foam filling it

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2 years ago#7
mickpearson
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HI KLOWN KING. silicone can be made not to stick to itself by applying release agent. a silicon casting can be made not by pouring it all in but painting it inside the silicon mould to make masters for reverse moulds. but if you get hold of a digital camera. take some snaps and let us see what you want to do and be able to help you better. i put my memory card in the computer then type my message then hit the attach photos. then upload

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2 years ago#8
Klown King
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yea, I think I will go with the thick pull foam filled.

Thanks for the advise, very helpful.

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2 years ago#9
Klown King
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Its a Plaster mold I was going to paint the silicone inside of, and then make plaster production molds from that silicone master. But I think I would have to much trouble trying to get the plaster to stick to the silicone master.

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2 years ago#10
mickpearson
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if say as an example i made a silicone casting inside my original silicone mould then all the detail will be on the outside of my silicone casting i would then use this casting and paint on layers of plaster.then the detail will be transferred on the inside of my plaster what will now be my mould. for painting in the latex. a reverse mould.

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2 years ago#11
mickpearson
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the plaster will stick to the silicone easy what i think is meant that you will be able to take the plaster out of the silicone mould without any problem as it will not stick on removal hope that makes sense

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2 years ago#12
mickpearson
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when you first start out making things all the info can fry your brains but once you get into it there is nothing shakin but the leaves on the treas.

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2 years ago#13
Klown King
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So your saying plaster can be applied to silicone ? can I paint silicone inside a plaster mold without it falling out of the detail ? Have you done it ?

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2 years ago#14
mickpearson
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trees.

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2 years ago#15
mickpearson
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plaster can be used to make mother moulds from latex or silicon so why not there is a picture of one of my plaster mother moulds on a latex without a release agent that i posted on this site.

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2 years ago#16
Klown King
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makes since, will the silicone stick to the cured plaster ? I was told to use mold soap and mold release /.. lol..yea my brains fried already.. It seems like I keep asking the same questions but its really just different approaches to the same result.

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2 years ago#17
mickpearson
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silicone or latex dose not need a release agent to make a mould from plaster but if you use a quick spray release like zombie was saying it will make it better for taking of the plaster without any pull.

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2 years ago#18
Klown King
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Yea, I know plaster can be applied to a latex master, I was going with silicone because it wouldn't shrink like latex. I have a gallon of Mold Max 30, I was going to paint it inside the plaster mold coated with mold soap and mold release. When cured, pull the Silicone cast, fill with foam and make plaster production molds from the silicone cast.

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2 years ago#19
mickpearson
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iv'e never used the foam so i don't know what it is like but i understand what you are saying.you are going to make reverse moulds for your plaster stiffen up the silicone so you can make more plaster moulds for a production line.you can go with the foam inside your silicone or use two part resin. that is not like layup resin and dose not smell very much.

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2 years ago#20
mickpearson
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have you seen the video on youtube making your own vac former by fx. if you had one you could have lots of plastic moulds that you could paint inside with latex as a lot of mass produced masks are made that way for Halloween.

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2 years ago#21
Klown King
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Exactly, so you think this will work ? I wont have any problems with the relationship between the silicone and the plaster. It will have to go both ways. Silicone to cured plaster 1st, Then wet plaster to cured silicone master.

Do you think the mold seal and the mold release will be needed for these applications ?

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2 years ago#22
Klown King
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no I will check that out !

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2 years ago#23
mickpearson
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not really a necessity but just a spray release without the soap will help with an even easier release.you will not have any problems with your plans.

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2 years ago#24
Klown King
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thanks alot, thats a big load off my fried brain..lol..this stuff will drive you nuts

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2 years ago#25
mickpearson
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yea. but once you get in the swing its not so bad. and you will even enjoy it. you have to walk before you run.

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2 years ago#26
ZOMBIE7666
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Lol this is getting much to complex

Simple answers:

1.Silicone need no mold release on plaster (or really anything for that matter as the only thing silcon will really stick to is itself )
the reason people use mold releases on silcone is to prolong the life of the mold.
Assuming you'll only be attempting to make a few production molds it'll work just fine.

2.You can indeed brush silicone into a plaster mold and it'll work just fine. The only problem you may run into is the silicone running down after being applied.
For that reason i'd recommend using rebound 25 from smooth on as it is meant to be brushed on and it has a pretty quick cure time as I recall. You can also thicken up the stuff you have with Thi-vex (silicone thickener)... it basically makes whatever silicone you want to use brushable.

3. how many masks are you intending to make?!? lol
I usually make a master just incase the mold breaks so I have a backup to recast, but if your just intending to do a run of masks one mold will pump out at least a hundred if not more depending on the complexity of the sculpt.

Last but not least...I thought about what your up to and I might have givin ya wrong intel..
If your gonna make multiple 2 piece plaster molds what I said will work fine (thick pull+ foam)
but If you are intending to make the one piece plaster molds you will indeed have to make your sculpt extra large to account for shinkagex2 and you wont foam fill your master as doin so will make it impossible to remove...
make sense?

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2 years ago#27
Klown King
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Plenty Of sense, man Im glad I found this site,,lol

I couldent thank you guys enough for all the useful info.

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2 years ago#28
ZOMBIE7666
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haha no worries dude... Send us some pics of your sculpt when ya got em... I'd love to see what your workin on

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2 years ago#29
Klown King
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no problem

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