Stoner ME 301S (Eject-IT 33Petrolease )

Stoner ME 301S (formerly known as Eject-IT 33 / Petrolease) is a petrolatum-based release agent in aerosol format that lets you apply a thin, even coat over any mold in seconds. Forget brushing on petroleum jelly by hand: this spray gives you all its benefits — universal compatibility, smooth release, no inhibition — without the mess or clumping. It is the go-to release agent for encapsulated silicones, urethanes, and special effects applications.

Technical specifications

What it is used for

Stoner ME 301S is a versatile release agent designed for special effects workshops, prosthetics manufacturing, urethane molding, and composites. Its petrolatum base makes it especially suitable for materials that require a neutral, non-reactive release agent.

• Releasing encapsulated silicone applications (Platsil Gel and similar) from rigid or flexible molds.
• Releasing Super Baldiez pieces from any type of mold.
• Releasing urethane rubbers and polyurethane foams.
• Releasing polyester and epoxy resins (in non-porous molds).
• Separator between layers of materials that could bond to each other during the manufacturing process.
• Temporary protection of silicone, plaster, or fiberglass molds between uses.
• Special effects and prosthetics applications where a gentle, easy-to-apply release agent is needed.

How to use it

1. Make sure the mold is clean, dry, and free of residue from previous materials.
2. Shake the can well before use.
3. Apply the spray at a distance of about 20–30 cm from the mold, using even strokes to achieve a thin, uniform coat.
4. Cover all internal surfaces of the mold, including angles and hard-to-reach areas.
5. Wait several minutes for the propellant to evaporate completely before pouring or applying the molding material. This step is critical.
6. If the mold is very absorbent (plaster, gypsum), apply a second thin coat after the first has evaporated.
7. Pour or apply the molding material in the usual way.
8. Once the material has cured, demold carefully. If necessary, apply a small burst of air between the piece and the mold to help separation.

Usage tips

Avoid over-application

A thin coat is sufficient and better than a thick one. Excess petroleum jelly can build up in fine details of the mold and reproduce on the finished piece as dull spots or marks. If you see pooling or heavily loaded shiny areas, remove the excess with a soft brush or gauze before pouring the material.

Propellant evaporation time

The most overlooked and most important step: the aerosol propellant needs to evaporate completely before introducing the molding material. If you do not wait long enough (minimum 3–5 minutes, longer in cold or humid environments), the propellant can generate bubbles or affect the cure, especially in platinum silicones. If in doubt, wait longer.

Compatibility with Super Baldiez and encapsulated silicones

Stoner ME 301S is the release agent of choice for demolding encapsulated silicone applications such as Platsil Gel and for Super Baldiez pieces. In these cases, apply a generous but even coat over the entire mold, paying particular attention to the edges and mold parting areas, where adhesion tends to be greatest.

Frequently asked questions