Back to Ganoksin | FAQ | Contact

New Mold Rubber


Hi Roger, I was at the N.Y. MJSA EXPO working at the Castaldo
booth demonstrating the new 2 part mold compound. This is really
cool stuff! You don’t need a vac to remove bubbles or even a
vulcanizer to cook it. You take equal parts (as close as you can
eyeball) and massage them together until they are one color and
put it in a mold frame with your model then put some metal plates
on each side and clamp. You can use a cold vulcanizer, a bench
vice, or even a couple of large “C” clamps. I mentioned to some
art students that you could take some of the stuff with you and
use it to pick up interesting textures off almost anything, rock,
wood, metal, etc… They got very excited about that idea. When
it is at room temp it will cure at 70F in about 15 minutes. When
it is cooler it can take up to 30-40 min. It is non-toxic and it
has zero shrinkage. J.A.


John, How do we get a sample kit of this new material? I hate
to cut molds and at this point don’t have a vulcanizer. Do you
have an e-mail address at Castaldo where we could request a kit?
Thanks for any you might
be able to provide.


Dear Ms Olney,

I'd be happy to send you a sample of our new CASTALDO Quick-sil

15-minute silicone RTV putty if you’ll give me your shipping

Anyone else interested??

Michael Knight

** Hanuman’s Note:

Anyone else interested??
Please contact Mr. Michael Knight offlist



From all the I’ve heard so far this sounds like
something I should try out. Sounds like it would make life a lot
easier around the shop. I don’t usually make my own molds
because I find them such a pain to do, but I’d like to give this
stuff a try.


Michael Hodgson
2342 Shattuck Ave. #331
Berkeley, CA 94704


Hi Michael

Will you please tell us something about this RTV putty. I use
several pounds of RTV each year and am interested in the various
qualities of this putty. Regards Jeff Booth


Hello Nina! Just read your request for the new molding
process. If you want to cook a mold without a vulcanizer, you
can! All you need is a frame and two pieces of 1/4"
aluminum.You’ll need at least two (four is better) c-clamps. Use
as little extra rubber as possible to predictably fill the mold.
Use a lenght of pipe for more leverage when tightening.Not too
tight until after 10 minutes under temperature. Then reef on the
clamps and tighten as much as you can. You may want to tighten
again after another 5 or 10 minutes.

You guessed it it’s in your kitchen oven! The newer ones are
surprisingly well calibrated to the temp dial. you may want to
test the temperature with a thermometer before your first mold.
I needed to mold a piece a few years ago and had arranged to
borrow a vulcanizer. Needless to say I couldn’t get it in time.
I’ve been doing it this way for years now with all the castaldo
rubbers. My favorite is the silicone gold. Hope I’ve helped.It’s
always been hard to justify buying a vulcanizer when I mold so
infrequently. Use a good pair of oven mittens when handling the
hot clamps and frame.

		Bye for now,


Thanks so much for your reply. My husband’s ovens are “New” and
he wouldn’t let me come within a mile using “stinky stuff”, could
I use a toaster oven instead??



You don’t need any oven with Quick Sil from Castaldo! A simple
2-part mold compound you simply knead together & pack into a mold
frame. Clamp between two steel plates and wait about 20-30 min.
It’s no-shrink and no mess. Call 508-520-1666 for your free and
very generious sample. Best; Steve

P.S. I don’t work for or hold any stock in Castaldo.
Just love the product even though it’s made my valcanizer

Thanks so much for your reply.  My husband's ovens are "New" and
he wouldn't let me come within a mile using "stinky stuff", could
I use a toaster oven instead??

Why even bother with ovens? I got a sample of Castaldo’s RTV
Rubber compound…its RUBBER, not silicone and makes tough,
nice molds. You do have to let it cure a day or two, but its real
easy to use, no mess, and makes a rubber compound thats really
tough, I suspect even tougher than traditional rubber
molds…great stuff…Dave

Crystalguy Jewelry, the first art jewelry site on the net
Art jewelry with a mystic touch / Now accepting credit cards
Paddle Jewelry for River Addicts


Dave: Have you had a bad experience with RTV molds? Personaly,
I’ve been using both the pour-in and the no-bake RTV lately and
found absolutly no problems. I like the no-bake "Quick Sil"
product best of all. Quick, clean and makes excellent molds of
most anything. You can even cast in low-temp. metals once or
twice with it! A handy thing when you only need a one-off!



Steve: no actually I was wondering why anyone really needs to
buy a vulcanizer or use an oven when this rtv stuff works so
well. I got a sample of the Castaldo rtv rubber and love it! Got
a sample of the quick sil also but don’t have a traditional mold
frame to try it in, but hear its also great. But, yes I did have
a no fun experience with my first mold rtv stuff , the clear
Ditto stuff from Rio which is a nightmare to work with as well as
incredibly expensive. I wish Castaldo would make an rtv clear
compound easy to use for us novice mold cutters…Dave


Can Quick Sil be used to make a separation mold? Has anyone
tried it? Is there any reason why it wouldn’t work?

I’m resisting learning to cut molds.




Hi Elaine, I’ve not yet used Quick Sil, but I have not cut the
last 500 or so molds I’ve made either. Put talc (I use baby
powder) in the center and a traditional mold will not bond
together. No cutting. Its a great trick. Have fun. Tom Arnold


Dear Elaine in Chicago

 Quick-Sil makes wonderful separation molds, especially when

used with our new Mold Separation Cream (send me your shipping
address and I’ll gladly send you a free sample.)

The only problem is that Quick-Sil, being soft, deforms in the

mold frame when you press it and thus the location of the parting
line is a little hard to control. But it depends on the mold, the
piece being molded, etc.

One way around that is to make  one half of the mold, let it

cure, treat it with separation cream and then finish the mold

As you might have guessed, separation molds using Quick Sil
require a bit of experimentation. But it works well and easily.

Michael Knight
F.E. Knight, Inc., 120 Constitution Blvd., Franklin, MA 02038 |
508/520-1666 |


Elane: Quick-Silv is so easy to cut, there’s really no reason not
to do it. Believe me, I’ve cut many vulcanized rubber molds and
this stuff cuts like a breeze. There is no way to make a
seperation mold with it that I know of.

Resistance is futile!