Using The Best Latex Casting Rubber

RD 407 Mask Making Latex is considered the best liquid latex casting rubber not just for making masks, but also gloves, props, coating and other uses. It is easy to use but does require some careful handling.

Liquid latex rubber is a popular mold making material because of its tough, durable, tear resistant and economical aspects. The same is also used as a makeup and special effects product to create varying effects for film and theatre.

In addition, there is latex casting rubber variants which are less viscous than the mold making latex rubbers. These are commonly used for making hollow toys, props, puppet heads and masks. In fact, RD-407 Mask Making Latex is considered the industry standard for making latex masks, props, gloves and a skin over polyurethane foams. This is a high quality latex that is favored by professional artists for masks, body parts and other thin skin latex products.

Latex casting rubber is very easy to use when compared to other casting materials. It comes in a ready-to-use liquid form and just has to be poured into the mold. It is swished properly in the mold and allowed to sit for a couple of hours before being poured out again. The latex that remains clinging to the sides of the mold will dry gradually and can be peeled out to become the actual thin skin cast.

Apart from making masks and props, the same RD 407 latex rubber can also be used to coat fabrics for waterproofing and insulating tools. Dipping the model into the latex and allowing the coat to dry before repeating the steps will build up a suitable protective coating over the same. Alternatively, the same latex can also be used to coat foam that has been carved into the desired shape.

A latex cast can be sanded, painted and finished as required. It will be elastic and flexible but still stays durable for years to come. Even the amount of hardness and flexibility of the rubber casting can be manipulated by adding an extender and filler like RubRfil.

Care during use

Liquid latex rubber is a simple product that can be used easily. It has a long shelf life and can be used whenever desired.

In case a stored latex rubber turns thick, it can always be thinned by adding some distilled water to get the desired consistency. The ammonia in the latex will also tend to evaporate. In case the ammonia smell is diminished, adding some aqua ammonia from a chemical store will restore it back to normal. However, latex should never be allowed to freeze as this will render it unusable. Special handling is necessary during the freezing months of winter.

In sum, casting latex rubber is a multi-use product that is commonly used to make latex mask but has other useful applications as well. In fact, it can be used to create almost any effect as a cast or directly on the skin as well.

Casting in Single and Two-Part Molds

The casting procedure will vary depending on the technique used for making the mold. Casting a single piece mold is easier than a multi-part one, but the results will definitely be up to the mark.

The simplest process of mold making is to cover the model with an appropriate mold making material and let it set properly. Once cured and demolded, the covering will reveal a negative impression of the model complete with all the grooves, nooks and other details.

Different techniques of making molds – such as block, blanket, glove, poured, slush, etc. – can be used depending on the type of model and choice of materials. A model that is too floppy, has undercuts or does not have a flat bottom will even require the mold to be made in two or parts, called a multi-part mold.

Irrespective of the method and type of mold, once it is ready it is time to make the positive through the casting process. Here, the actual procedure for casting will vary depending on whether it is a single or multi-part mold.

Single mold casting – Casting in a single piece mold is quite easy. All that the artist has to do is mix the casting material of choice and pour it into the mold. The cast will set in some time and can be demolded before allowing it to cure completely. Care will have to be taken about applying a release agent, eliminating air bubbles and the like. However, the process still remains straightforward and the cast will be ready once it is finished and polished properly.

Multi-part mold casting – Making a mold in two or parts is definitely a complicated and time-consuming process. It follows that the casting process will not be simple either.

The process begins with aligning the different parts of the mold based on the keys. Once the mold comes together properly, it should be secured using heavy-duty bands. Backing boards will also be required in case the mold is flexible.

After securing the mold, the casting material can be mixed and poured into the mold through the sprue or air hole. Care is required again to ensure that the mold is full of the casting material and it reaches every indentation and undercut of the mold. Applying a release agent and eliminating air bubbles is obligatory yet again.

The cast is then allowed to set inside before removing the bands and pulling the mold parts apart. The cast can be removed and allowed to cure further. Cleaning, finishing and painting can be done as needed.

In sum, the techniques for casting in single and two part molds may be a bit different, but the final cast will definitely not leave anything wanting as long as the procedure is properly followed.

Once the cast is ready, it can be displayed or used as planned. Even the mold can be used to make multiple casts if it is not torn down when demolding the cast.