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Release Agent Recommendations (Please thoroughly understand the specific material of your mold before use):
**Dedicated Release Agents for ABS/PP Plastic Concrete Molds** (Key Rule: Strictly prohibit the use of pure machine oil, solvent oils, or strong solvent-based release agents, as these will cause swelling, discoloration, corrosion, and cracking of the plastic.)
1. **Modified Synthetic Ester Water-based Release Agent** (Optimal Choice; Universal for ABS & PP)
**Composition:** Plant-based synthetic esters + Emulsifiers + Water. Contains no aromatic solvents or heavy oils; does not corrode ABS or cause swelling in PP.
**Dilution:** Dilute the concentrated stock solution with water at a ratio of 1:3 to 1:6. Apply a thin, even coat using a brush or spray gun; pour the concrete once the surface is dry to the touch.
**Advantages:**
✅ Prevents discoloration, blistering, and swelling in both PP and ABS molds; ensures molds retain their shape even after repeated, long-term use.
✅ Minimizes oil stains on the concrete surface, allowing finished products to be painted or colored directly.
✅ A single application facilitates 3 to 6 consecutive mold releases, offering the highest cost-effectiveness for mass production.
2. **Weakly Modified Water-based Silicone Release Agent** (For High-Gloss, Premium Parts)
**Composition:** A water-based emulsion of polyether-modified organosilicone. Used after dilution with water; forms a very thin film and produces a mirror-like finish.
**Suitable for:** High-gloss ABS molds and white “fair-faced” (exposed) concrete parts. **Disadvantage:** Higher cost compared to other options. Additionally, silicone residue may interfere with adhesion; if your finished concrete parts require subsequent tiling or bonding, we recommend selecting the synthetic ester-based option mentioned above instead.
Recommended Release Agents for Pouring Concrete into FRP Fiberglass Molds (Ranked by Practical Priority)
1. **Water-based Polymer Concrete-Specific Release Agent** (First Choice; Universal for Precast Fair-faced Concrete)
**Composition:** Polymer emulsion, silicone emulsion, surfactants, water.
**Usage:** Dilute the concentrated solution with water at a ratio of 1:2 to 1:5; apply a thin, single coat using a brush or spray gun; allow to dry completely before pouring concrete.
**Advantages:**
* Does not corrode FRP; prevents oil seepage.
* Finished concrete products are free of oil stains, facilitating subsequent painting or tiling.
* Molds can be cleaned simply with water.
* Ideal for flower pots, cement ornaments, and fair-faced precast elements.
* The preferred choice for indoor mass production; eco-friendly and odorless.
**Disadvantages:** Dries slowly in low temperatures; use with caution in humid environments.
2. **Emulsified Machine Oil / Saponified Oil Release Agent** (For High-Turnover Mass Production and Complex/Irregular Molds)
**Composition:** Mineral oil + emulsifiers (forms a milky-white emulsion).
**Usage:** Apply the concentrated solution (or a slightly diluted version) via brushing to create an isolating oil film.
**Advantages:** Ensures smooth demolding; a single application allows for 3 to 8 consecutive demolding cycles.
* Prevents sticking in deep grooves and complex-shaped cement products.
**Disadvantages:** Leaves a slight oil film on the concrete surface; requires sanding to remove oil residue if subsequent plastering or painting is required.
**Simple, Low-Cost Emergency Solutions** (For Temporary/Emergency Use Only)
* **Waste Machine Oil + Dish Soap (Mixed with Water):** (Ratio: 10 parts oil/soap mixture to 1 part water; stir well). Inexpensive, but highly prone to oil seepage, which contaminates the cement surface; suitable only for non-aesthetic components.
* **Concentrated Soapy Water:** Short-acting; suitable only for simple, flat molds. Use with caution on FRP molds with high water absorption rates.
**Silicone Molds**
* Silicone naturally possesses inherent oily properties; therefore, no release agent is required—concrete can be poured directly into the mold.
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$33.16 $53.16Price range: $33.16 through $53.16
Base on injection process, we focus on plastic ABS molds & plastic Polypropelene molds more than 15 years. CATALOG OF CONCRETE MOLDS: Commercial concrete planter molds, Roman column molds, Breeze block molds, Baluster molds, DIY walk maker forms and other Garden decor molds etc.
Silicone molds for concrete have always been in a very high position among DIY enthusiasts. Inexpensive, easy to make, are its main advantages. Such as: Small planter molds, Candle molds, Soap molds, Skull molds etc.
Normally, The latex molds only for custom service, because it is the most cost-effective manufacturing process for customizing a small order of molds. Of course, silicone molds can also do this, The choice of latex or silicone ultimately depends on the customization needs of customers. The most common is to use in the production of concrete / plaster sculptures.
In the true sense, the size of industrial-grade concrete molds is very large, which has a great test for the durability of mold materials. Therefore, steel and fiberglass are the best choices. The disadvantage is that they can only be applied to engineering projects with relatively simple shapes. Such as utility poles, sewer wells, prefabrication of culverts, etc. At present, LCMOLDS accepted customized services only.
Prefabricated raw materials (concrete, silica gel, plaster, etc.), molds, release agent(for Plastic Molds only),gloves, goggles, scales, mixing tools, support, operating instructions, etc.
These will be better to help you complete the project.
1. Calculate the weight of water needed to fill the mold.
For example: A planter mold weighs 1000 grams, and the total weight when filled with water is 2000 grams. Therefore, the weight of water needed is 2000 grams (total weight) – 1000 grams (mold weight) = 1000 grams (water weight).
2. Calculate the weight of cement required.
The density ratio of water to concrete is 1:1.88. Therefore, the amount of cement needed is: 1000g x 1.88 = 1880g
3. Calculate the weight of water needed for mixing the concrete.
Cement weight x 25% = 1880 x 25% = 470g
Therefore, the amount of cement needed to cast this concrete planter pot is 1880g, and the amount of water needed is 470g.
Usually we often talk that the mold release agent is mainly used in plastic(ABS, PP) molds. Before pouring, it should be applied on the inner wall of the mold first. The advantage is that it is convenient to demould after the prefabrication is completed.
Molds made of other materials, such as silicone molds, are not suitable.
Concrete needs to be mixed, so you must control the ratio of various raw materials. During the pouring process, the construction should be done slowly and at a constant speed. When necessary, a vibrating table or a vibrating rod is required to remove the air bubbles in the concrete. After completion, wait for the concrete to solidify and form, depending on the temperature or environment, ordinary concrete takes 24-48 hours.Â
If you are using a special type of quick-setting cement, please refer to its specific demolding time specifications (for example, some types can be demolded after 4 hours).
For the demoulding of large-sized concrete blocks, you can use a rubber hammer to lightly hit all angles of the mold, and the finished product will fall off naturally-provided that the mold release agent has been applied to the inner wall of the mould.
After the finished concrete is demoulded, its strength is not fully hardened, so it must be placed in a ventilated place to dry naturally (it takes about 12-24 hours). Note: Prohibit sun exposure and rain.
If have more perfect DIY molds or know how to easy concrete precasting or molding release, please give us more of your ideas, maybe, you love to help more families.
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