Re: Making molds from original sculptures
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Topic History of: Making molds from original sculptures
Max. showing the last posts - (Last post first)
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Gee Bee
Great info. I would not have thought of that.
Wolff
Jeff wrote:

I find urethane to be very forgiving, btw.


Urethane is very sensitive to any moisture that may be in the model, the board it sets on, even wood tools etc., silicone is a much better more forgiving mold compound that doesn't have that problem, in fact the rubber I use can be molded over moist or wet clay with no problem at all.
Urethanes that pick up any moisture can stop curing and wow what a mess!

On the mold making and damage, making a mold of a delicate, old original, or an original carries some risks, the rubber could react and fail to cure, (common) the rubber could be defective as a batch and fail to cure (rare) the rubber can stick like glue to the original despite use of release (had that happen with a wood carving, I had to burn scrape and melt the rubber off it)
The mold maker can **** up, it happens.
If spraying on a sealer or risk of damage is unacceptable to you, then don't have a mold made.

The only rubber I know of that Ive used twice on delicate antiques, both were painted wood, is Body Double by Smooth-on, it will not stick to anything, no sealer or relase was used, and is a simple 1:1 mix, ready to pull off and use in less than one hour. It is VERY expensive and for large pieces the cost would be prohibitive.
It was around $100 plus shipping for 2 trial kits, about 4 pounds worth, the 2 trial kits I ordered was just enough to make a mold of a flat plaque about 10"x 10" or so.
red46
I'm a custom mold maker. You can contact me at <email>

As for not disturbing the original, it depends on what the sculpture is made of. I can help with that.
Judy
sculptureIQ
I generally try to create my own molds- there are some really cost effective, easy-to-use products, but you must make sure that you choose your products with care.

If they arrive on time, Townsend Atelier's Knead a Mold and Brush a mold, which work in conjunction with their Swell Shell, are easy to use. Beware, though. Townsend Atelier has great customer service until something goes wrong. Townsed Atelier's customer service folks take your money, make promises, and then you may have to wait months for your product to arrive.

I recommend trying to make your own molds, but stay away from Townsend Atelier.
Jeff
To answer your question directly I don't know of any company that makes molds specifically for your application. I do know, however, that people have come to me with this exact same problem.
Whenever I make a mold I try to reassure the customer that a successful casting may mean degradation of the original. I've been fortunate to have had great success in not damaging originals.
The secret, as others have mentioned, is to match the molding material to the model material.
I find urethane to be very forgiving, btw.
hmmsoup
Tin cured silicone is not affected by sulfur in clay. Any tin cured silicone should work just fine as a mold rubber. If the sculpture is in soft clay it will be damaged by the mold process, however, once you have the mold you can make as many as you want just like the original!
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