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Facts on Penis Molding (Penis Moulding), and Penis Casting

Casting a dildo directly from one’s own penis is a relatively new phenomenon, but it seems to be catching on as the new standard in custom sex-toys. How to mold a penis? How to cast a penis? Following is some general information on the molding and casting of an actual penis, including which materials to avoid and which to employ in order to yield the best results.

The most important factor to consider when casting a body part is the quality and properties of the molding and casting materials being used. Generally, a sodium alginate* powder is used to form the MOLD (the negative impression), and a type of resin system is used to form the CAST (the positive ‘finished’ dildo). This resin system may be epoxy, polyester, silicone, RTV rubber, or a number of other possibilities.

Use a high-quality, body casting alginate mixed with warm (at least 70 degree F) water. An alginate that has been buffered to set in a specific amount of time will always produce the best mold in terms of detail. Having a definite time-frame that specifies exactly when to insert your penis and when to pull it out is essential to molding an erect penis. A super-fast set alginate is not ideal, as you will lose your erection while mixing and pouring, and a fast-set won’t capture the detail you need to create a life-like replica. Instead, you’ll want enough time to mix your alginate with water, pour it into your molding container, give yourself that last little bit of stimulus to ensure a complete erection, and then insert your penis. Once inserted, you’ll want the mixture to set-up right away (this is referred to as a delayed ‘Snap Set’). Hands-down, this is the absolute best method for molding an erect penis. Empire Labs’ kits (Clone A Willy, Make Your Own Dildo, Clone A Pussy, etc) all utilize a specially-timed ‘Snap Set’ Alginate, allowing the user a specific amount of time to mix, pour, get ready, and once the timer signals, insert themselves for just seconds. Less expensive, Fast-Set Alginates (Dental Alginates) are designed to be mixed in very small amounts, allowing them to be thoroughly mixed with water in just seconds. Molding a penis takes a considerable amount more alginate and water, and thus considerably more mixing time. Ultra Fast-Set Alginates mixed in quantities larger than that for which they’re intended will begin to gel in some areas before you’re even finished mixing it all. You may still get a mold if you’re really quick, but it won’t capture nearly the detail. Without the fine detail, your finished dildo will look like nothing more than a blob. Whether molding your penis alone or with a friend, a buffered, body casting alginate with a workable time-frame is an absolute must.

There are many aspects to consider regarding which casting material to use. First off, you’ll want to use a material that won’t shrink during cure. The uncured rubber material found in any molding/casting kit has what’s known as a linear shrinkage factor. Most Silicone Resin Systems will have a shrinkage factor of .007in/in or greater(1), and compounds that include Latex are far worse. Even this little bit of shrinkage can mean a lot when copying a man’s penis. Look for a casting resin that has a shrinkage factor of .001in/in. or less (as with any Empire Labs, Inc. kit(2)). No man wants shrinkage when casting his penis!
Another important consideration when casting is DETAIL. How realistic will your finished dildo be? There are countless factors at play here, and exploring them all would take a great deal of time and space. The simplest, best way to determine how your dildo will turn out is to simply look at the pictures available from the manufacturer. Regardless of whatever claims they make, if the images they have on display don’t look amazing, neither will your finished dildo. Keep in mind that these are the best replicas the manufacturer has been able to produce, and yours most definitely will not look any better.

What To Avoid
Stay away from molding with plaster and plaster products as they are mostly exothermic (they release heat when curing). There is potential for burns to the skin when molding with plaster, and that’s not an area most men would like to scald. Because plaster becomes rigid, it is difficult to handle and remove, especially from body hair. Casting (forming your positive) with plaster is fine, as the plaster won’t come in contact with your skin (this is what Cynthia Plaster Caster did). A plaster cast, however, won’t be as realistic, durable, detailed, or as much fun as a softer, skin-like cast.

Stay away from casting with any chemically harsh materials. Many uncured resins contain TDI’s, or toluene diisocyanates, which have been found to be carcinogenic(3). Empire Labs, Inc. does not use products containing TDI’s. You’ll also want to stay away from Latex. Aside from the fact that latex allergies are quite common, it will noticeably deform during cure, including a great deal of shrinkage.

General Tips
Above all, TRUST the company from which you’re buying. Check the manufacturer – are they reachable? Is there 24 hour live operator assistance? Will the company back-up their product?
Often a good measure of quality / reliability is whether or not you see the product on store shelves. Most shops won’t carry a product that doesn’t perform as it claims or they risk their reputation. Additionally, stores certainly don’t want returns. Also, look for objective reviews on the product. Reviews posted directly on a website may not be valid, so look for articles in magazines and weblogs from names you trust.

A History Of Penis Casting
The Original penis caster appears to be Cynthia Plaster Caster; who developed a name for herself in the 60’s by casting simple plaster copies of musician’s penises. These copies were merely show-pieces and not intended for actual use, but a fun idea. Since then, casting materials and technology have dramatically improved, leading to the finely detailed, flesh-like casting kit one can find today in almost any adult-toy shop. There are currently a few ‘kits’ on the market, many claiming to be the first; a claim nobody seems to be able to substantiate. One such product has changed their date of inception multiple times, perpetually descending their original idea further back into history.

The first ascertainable website to have sold or mentioned an actual ‘Penis Molding Kit’ doesn’t seem to have appeared until 1997(4). The first quantifiable mention of such a kit in the press, as well as the first to publicly go on sale in a store, seems to be in April of 1998, reflected in an issue of the San Francisco Bay Guardian(5), followed by a 1998 article in Playgirl Magazine(6). Finding any verifiable data on the sale of such a kit before this proves unachievable.

Related Terms:
Clone-A-Willy, Make Your Own Dildo, Create-A-Mate, Proud Pecker, Clone Your Bone, Penis Mold Kit, Penis Casting Kit, Penis Mold, Penis Replica, Silicone Dildo, Rubber Dildo, Glass Dildo, Plaster Dildo

*What is alginate? Alginate is a totally safe, rubbery material derived from brown seaweeds. It is commonly used by dentists to form impressions of teeth. Variations are often used as fillers in ice cream, hamburgers, and countless other foods. Top quality alginates contain more alginic acid, which is the most expensive component of the alginate. To capture fine detail such as fingerprints, you’ll need a high quality alginate with a high concentration of alginic acid. Typically dentists don’t use the top quality stuff, so go with varieties designed specifically for body casting rather than cheaper Quick-Set Dental grades.

(1). Science of Silicone Polymers. Centre Européen des Silicones – CES (2005).
(2). Empire Laboratories, Inc. Casting Resin Product Data / MSDS
(3). NIOSH, Current Intelligence Bulletin 53, " Toluene Diisocyanate (TDI) and Toluenediame (TDA) Evidence of Carcinogenicity, December 1989
(4).; (Empire Labs, Inc.). The BODYDOUBLE Kit
,; (C.Y.B.). The Clone Your Bone Kit.
(5). San Francisco Bay Guardian Vol. 32 No. 29 (April 1998). PENIS MOLDING KIT: Abacus Prosthetic (Empire Labs, Inc.)
(6). Playgirl Magazine (Dec 1998).