Shop Mobile More Submit  Join Login
molding casting Nosferatu Jr by RandyHand molding casting Nosferatu Jr by RandyHand
So here's the process I used to mold and cast the Nosferatu Jr.
My buddy Jerome Ranft showed me this molding trick and it works really well for smaller pieces.
There is a few other molding techniques I use but this one is pretty slick...
So here it is in a nutshell...

1. First I figured out how the piece could be cut in half...Some more complex pieces may not lend themselves to this without cutting off parts and molding them separately. I built up clay around the piece where I felt the separation line should be...Often I'll use a sharpie to make a line where I want to build the clay up to...
2. I use Lego's to build walls around the whole piece. Then make sure the clay is up to all the walls so the liquid mold rubber can't run down between the legos and the clay. I couldn't find Lego brand blocks so there was a tiny bit of space between the blocks...Because of this I smeared a thin layer of clay in to all the cracks...
You'll also notice I made indentions (keys) in the clay,so that the mold halves fit together, or register.
I also made some vent tubes out of clay from the knee cap to the hands and also on the bottoms of the feet. This will make the resin flow easier, eliminating air pockets...In addition to this I made a thick tube coming from the butt which will be the main pour area.
3.Just another shot from the side to show the build up with the blocks...
4.A two part silicone rubber molding material made by Polytek. For this I used Platsil 71-20
This is one of the easier mold rubbers to use since you don't need to use a gram scale. It's a simple half and half mixture...
5.I use 3 separate cups to mix the thick liquids. I pour one of each in separate cups and then pour the thinner liquid in to the thicker liquid's cup. I stir with either a kitchen spatula or a tongue depressor depending on the amount of mold material to mix. I mix very thoroughly and then pour this in the third cup. This ensures that all of it is mixed and you don't miss any on the bottom or sides. I thoroughly mix this some more and pour over the piece...
6. I make sure that I use an airbrush to blow the liquid in to the tight areas and ensure that there are no air bubbles on the piece...This will save a lot of headaches down the line.
7.The first half is done. I make sure that the blocks are stacked high enough to give the piece at least 3/8 inch of rubber or more covering the highest peak of the piece.
8-9 Flip the piece over and take the clay off the piece. You'll probably have to take some Lego's off to get at all the clay.
Then I take a cheap paint brush and smear a very thin layer of Vaseline all over the cured rubber and the piece so that the new rubber won't stick to it.
10.Lego's are stacked back up again...I pour up to the top just like the first half. Again, I make sure I have at least 3/8 inch of thickness of rubber covering the piece at it's highest point. If you look closely you can still see the clay for the vent tube from the knee to the hand is still in the rubber. I push it back down in the tube so that it stays hollow when the other half is poured. (does that make sense?)
11.Both halves of the mold pulled apart.
12.Another Polytek product...This is a two part resin that I use to cast my pieces in. I use Easy Flo 60 or Easy Flo 95...
The 95 is a slower setting resin while the 60 sets up quickly...
13. Before I pour the resin in, I tape up both halves with clear packing tape. Big rubber bands are good for holding the halves together as well.
14.Once the resin cures, the halves are pulled apart...
15. The cured piece ready to be dremmeled etc. Often there will be seam lines to be taken away along with the vent tubes and pour tube...To patch any air bubble holes, I use Apoxy Sculpt.
Hope this gives you a fun way to mold your own work!
If you have any questions about any of this, or if what I wrote is confusing, always feel free to message me...
Add a Comment:
 
:iconnycterisa:
NycterisA Featured By Owner May 12, 2014  Hobbyist General Artist
I am going to have to to learn how to do this. Thank you so much! (Oh boy this looks daunting..)
Reply
:iconrandyhand:
RandyHand Featured By Owner May 12, 2014
It's not too bad once you throw yourself in to it. :)
It looks more difficult than it really is.
good luck!
Reply
:iconintervain:
Intervain Featured By Owner Oct 25, 2013  Professional Digital Artist
Hey Randy

I would like to try that method for my next little experiment and I was wondering about sth you'd probably know well. Since I'll be sculpting in oil based clay does it matter what type of clay I use for the mold making? Does it have to be water based or can it also be oil based?
Reply
:iconrandyhand:
RandyHand Featured By Owner Oct 25, 2013
Hi Magdalena!
Are you going to be using a two part rubber to mould with?
Also, are you wanting to cast in bronze?...resin?
If you are going to cast strictly in bronze, then use a two part urethane mould rubber.
If you are wanting to cast in bronze and resin as well, then it's best to go with a silicone rubber.
I would sculpt with oil based clay no matter what.
Also, make sure the clay is sulfer free. If it has sulfer the rubber will never cure.
Hope that helps...
All my best,
Take care
Reply
:iconintervain:
Intervain Featured By Owner Oct 27, 2013  Professional Digital Artist
Thanks Randy! I want to cast in Resin only. I was more curious about using the clay for the walls. I read somewhere that if you're sculpting in oil based clay u have to use water based one for the mold making. Is that true? 

Thanks again for your time, that was very helpful about the choice of moulding product.
Reply
:iconrandyhand:
RandyHand Featured By Owner Oct 27, 2013
You bet Magdalena!
Now I'm a little confused.
Are you going to use rubber to mould at all?
For the walls, if you are using rubber, it would be better to use oil based clay for the walls. As long as it's sulfer free.
Or are you thinking of using clay as the mould making material?
Reply
:iconintervain:
Intervain Featured By Owner Oct 27, 2013  Professional Digital Artist
I guess what I'm thinking of is the clay you use to build up the wall around your model. You have to build it up half way through no? Or am I totally missing the point? haha I've never understood mould making other than the one where u brush the silicone on all over and cut it in half :)
Reply
:iconrandyhand:
RandyHand Featured By Owner Oct 27, 2013
Actually what would give me an easier way to give advice would be to see what the sculpture is going to be or at least a drawing.
For example, your Man and his pumpkin piece would need to be a two part rubber mould with a plaster mother mould.
Do you have a specific piece that I could see?
Reply
:iconkoox:
koox Featured By Owner Feb 8, 2012
where do buy the rtv silicone and the liquid plastiq ?
Reply
:iconrandyhand:
RandyHand Featured By Owner Feb 8, 2012
I get mine at a place close by...www.sculpturedepot.com...but they ship all over the place.
You could also do a google search of Polytek distributors that may be closer to you.
Good luck!
Take care
Reply
:iconkoox:
koox Featured By Owner Feb 10, 2012
thank a lot !!!!
Reply
:iconrandyhand:
RandyHand Featured By Owner Feb 10, 2012
You bet!
:highfive:
Reply
:iconerikonil:
Erikonil Featured By Owner Apr 13, 2011  Hobbyist General Artist
Thanks so much for putting this up. I've just started getting into sculpting and mold making and a walk though like this really helps to visualize everything. There's plenty of tutorials that tell, but don't show and for someone like me who really needs to see something, it's still a bit hard. Thanks so much!
Reply
:iconrandyhand:
RandyHand Featured By Owner Apr 14, 2011
you bet!
So glad you got something out of it...
Good luck with all of it....
Take care
Reply
:iconevanesces:
evanesces Featured By Owner Nov 7, 2010
a very cool and interesting tutorial!
Reply
:iconrandyhand:
RandyHand Featured By Owner Nov 8, 2010
Thanks so much!

Take care
Reply
:iconwindshock:
windshock Featured By Owner Oct 14, 2010  Hobbyist General Artist
nice details. tnx :)
Reply
:iconrandyhand:
RandyHand Featured By Owner Oct 16, 2010
You bet...glad you enjoyed it...
Thanks for adding me to your watch as well!
Really appreciate the support...
Take care
Reply
:iconwindshock:
windshock Featured By Owner Oct 21, 2010  Hobbyist General Artist
Same to you Sir, amazing works :)
Reply
:iconrandyhand:
RandyHand Featured By Owner Oct 21, 2010
:highfive:
Reply
:iconh-swilliams:
H-SWilliams Featured By Owner Apr 15, 2010
lego! that's a really neat trick. Everything I read on making small molds is always, cut perspex to size, make a box and glue it together, or cut up plastic cups or containers, always sounds wasteful and fiddly.

But lego would be great, it'd be all perfectly straight, easy to use for different sizes and probably reusable. How cool!

This makes me want to try to attempt making a mold and casting something in resin even more.
Reply
:iconnelsontubaina:
nelsontubaina Featured By Owner Apr 15, 2010  Student General Artist
u r GOD
Reply
:iconundead-art:
Undead-Art Featured By Owner Apr 14, 2010  Professional Artisan Crafter
Wow this is great I want to make molds but afraid I'll screw something up. Does this company Polytek have a website or is it better to buy the materials somewhere else?

:+fav:
Reply
:iconrandyhand:
RandyHand Featured By Owner Apr 14, 2010
Thanks man!
Making molds is a bit intimidating at first, but once you do your first one, it'sa piece of cake.
polytek does have a site if you haven't found it already.
It's at www.polytek.com
For smaller pieces and doing resin cast, right now I'm using Platsil 71-20
If you think you'll be doing a bunch of molds, spend a little extra and get the 16lb kit...
I know it's expensive but it's such an easy mold rubber to use.
Some other mold rubber's I've used sometimes require a gram scale...If you have a gram scale that's awesome.
I have a dial o gram scale by O-Haus and it's perfect for what I need it for.
Like I said, don't worry about that with the 71-20.
There's a few little tricks to using it, but please don't hesitate to message or note me with questions.
Another DA member jumped right in to using it without asking me some stuff and he ended up having to trash a piece because he rushed it.
Thanks for faving the little babies as well.

Good luck with the molding...You'll love it once you do it, I gaurantee...It's not difficult at all and it's a great way to cast multiple parts without having to re-sculpt each and every thing.
Take care,
Randy
Reply
:iconundead-art:
Undead-Art Featured By Owner Apr 14, 2010  Professional Artisan Crafter
Ahh thanks so much Randy you rock! Yea I find that my small items that are generic toys can be cast and painted. That way I can lower the price and move more inventory faster.

Thanks again you rock!
~Larry
Reply
:iconrandyhand:
RandyHand Featured By Owner Apr 14, 2010
Anytime Larry!
Yeah, it's really nice to be able to cast multiple pieces...especially if it keeps your prices down...
plus it gives you more time to create.
Have you ever used Easyflo 60 casting resin?
Reply
:iconundead-art:
Undead-Art Featured By Owner Apr 15, 2010  Professional Artisan Crafter
No is that good to use?
Reply
:iconrandyhand:
RandyHand Featured By Owner Apr 15, 2010
It's awesome stuff.
It sets up quickly and is really a nice hard resin.
There is also a slower setting up version called EZflo 90 (or 95? it's one of the two)
It gives you a little more time to work with the mold.
The EZflo 60 sets up within a few minutes..
It's cool because you'll stir it and then it starts getting warm and then this white kind of mossy stuff starts showing and then it goes from this honey colored and consistency liquid to solid white in a few short moments...
It's nice too because it's odorless.
You still want ventilation, but it's nice because it doesn't smell like fiberglass curing....
Reply
:iconundead-art:
Undead-Art Featured By Owner Apr 15, 2010  Professional Artisan Crafter
Nice! That's what I'd want to use I don't plan making anything bigger than a fist! After its set and it is ready to be painted is it easy to crave or clean up the flashing/vents?
Reply
:iconrandyhand:
RandyHand Featured By Owner Apr 18, 2010
It's really easy stuff to work with.
With that there is a tiny learning curve as well...
Like I said, please message me if you end up using both the moulding material or the resin.
I've used both extensively and know some little tricks that will keep you from losing your patience and wasting material...
Good luck my friend!
Take care
Reply
(1 Reply)
:iconfabreeze:
Fabreeze Featured By Owner Feb 13, 2010
clever!
Reply
:iconrandyhand:
RandyHand Featured By Owner Feb 14, 2010
Thanks so much!
Take care
Reply
:iconbluangel13:
Bluangel13 Featured By Owner Feb 12, 2010  Professional Artisan Crafter
Legos!! thats genius for wall I might try it out on a small piece next time I make a mold.
Reply
:iconrandyhand:
RandyHand Featured By Owner Feb 12, 2010
Thanks so much!
It really does take away a lot of headaches...
Good luck!
Take care
Reply
:iconcozmicdreamer:
CozmicDreamer Featured By Owner Feb 12, 2010
I would love to buy a casting of the Cheesy Tree model!
Reply
:iconrandyhand:
RandyHand Featured By Owner Feb 12, 2010
Thanks so much Amanda!
The bronze version I just submitted would be around $2,300 plus shipping...
I haven't poured any resins so I'm not sure what I would even charge on those yet...
I do need to make a separate mold for casting resins as well but that wouldn't take super long...
Just let me know through a note and I can give you details etc.
Hope all is great!
Take care
Reply
:iconcozmicdreamer:
CozmicDreamer Featured By Owner Feb 14, 2010
Awesome!:D
Reply
:iconlukeadore:
LukeAdore Featured By Owner Jan 22, 2010  Professional Artisan Crafter
lego mould walls! that is outright genius! we use mdf at work, id hat to think how much its cost us over the years. love your work!
Reply
:iconrandyhand:
RandyHand Featured By Owner Jan 22, 2010
Yeah, when my buddy showed me that technique, it really made things so much easier when moulding my small work.
I got an off brand of building block though and I have to seal off the inside with a smearing of soft oil based clay to keep the liquid silicone from leaking through. The Lego name brand seals a lot more tightly but the toy store I got my blocks at didn't carry those....
Thanks also for liking my work!
Really enjoyed going through your gallery...You've got some incredible work in there!
Take care
Reply
:iconpunisheris:
punisheris Featured By Owner Aug 7, 2009
how much for one?
Reply
:iconrandyhand:
RandyHand Featured By Owner Aug 10, 2009
I sell them for 65$ plus shipping...
Thanks for faving it as well!
Take care
Reply
:icongryphonsshadow:
gryphonsshadow Featured By Owner Jul 23, 2009  Student Traditional Artist
I've seen this kind of casting process before... but never with Legos, :lol: they seam to work well though.
Reply
:iconrandyhand:
RandyHand Featured By Owner Jul 24, 2009
Yeah, that Lego method is the unique part of the process that's for sure...
Really keeps the mold block square and easy to fit together...
Thanks,
Take care
Reply
:iconsavageworlds:
savageworlds Featured By Owner Jul 18, 2009
Great use for Lego blocks!=)
Reply
:iconrandyhand:
RandyHand Featured By Owner Jul 18, 2009
Thanks so much!
I was so glad when my buddy showed me this...
Thanks so much for faving it and Metamorph-fish!

Take care
Reply
:iconsavageworlds:
savageworlds Featured By Owner Jul 18, 2009
My pleasure, Randy!=) I've been around mold making for years, but just started doing my own within the past few months. Your descriptions and suggestions will definitely help.

Regards,
Tom-
--------
"Creativity is allowing yourself to make mistakes. Art is knowing which ones to keep." -(Scott Adams)
Reply
:iconrandyhand:
RandyHand Featured By Owner Jul 19, 2009
Thanks Tom!
I'm all about doing things easier and this method seemed to flip a switch for me.
I was looking through your gallery last night and was amazed by your work so I had to put a watch on you...
Looking forward to seeing all your future submissions!
Take care,
Randy
Reply
:iconsavageworlds:
savageworlds Featured By Owner Jul 19, 2009
I was just about to add you to to my watch list, too.

Cheerz!
Tom

------
"Appreciation is a wonderful thing: It makes what is excellent in others belong to us as well." -(Voltaire)
Reply
:iconrandyhand:
RandyHand Featured By Owner Jul 19, 2009
Thanks Tom!
Enjoy the rest of your weekend!
Take care,
Randy
Reply
:iconmichelecobb:
MicheleCobb Featured By Owner Jul 15, 2009
Looked at this as recommended by *flintlockprivateer
Nice one, thankyou for the info. :thumbsup:
Reply
Add a Comment:
 
×




Details

Submitted on
January 2, 2009
Image Size
1.3 MB
Resolution
613×1800
Link
Thumb
Embed

Stats

Views
10,841
Favourites
231 (who?)
Comments
129
Downloads
247

Camera Data

Make
Canon
Model
Canon PowerShot G5
Shutter Speed
1/20 second
Aperture
F/2.0
Focal Length
7 mm
Date Taken
Dec 15, 2008, 11:20:56 PM
×