• Trio-Size Versatility This complete set includes Large 21x17x17 inches, Medium 18x15x15 inches, and Small 15x13x13 inches dimensions, allowing you to create stunning “stair-step” arrangements or uniform clusters that fit any architectural space.
• Industrial-Strength Construction The heavy-duty fiberglass outer shell is reinforced with structural ribbing to prevent bowing or warping, ensuring your concrete planters maintain perfectly crisp, sharp corners and straight walls.
• Efficient Production Design Engineered for high-volume use, the multi-part bolting system and smooth interior surface ensure a fast turnaround time with minimal cleanup and easy de-molding for every pour.
• Architectural Minimalist Aesthetic The square, tall-profile design is a staple of modern landscape architecture. These molds produce a timeless, stone-like finish that complements both industrial and contemporary environments.

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.

Worldwide Free Shipping. We ship with USPS, FEDEX, CANADA POST, AU POST, CHINA POST. Click to vist our Shipping Policy.

All products can be returned within 90 days after receiving it. To learn more please visit Return & Refund Policy.