Building a fiberglass mold- the long road

sheldon trieb • October 4, 2024

Building a fiberglass pool mold

When it comes to creating a fiberglass pool, one of the essential steps in the process is building a fiberglass pool mold. This intricate and time-consuming task involves several meticulous steps that are crucial to the overall quality and durability of the final product. In this article, we will delve into the detailed process of making a pool mold from fiberglass, starting with the creation of the plug from MDF wood, finishing it to a glossy shine, and finally building the mold inside the plug.


 The first step in building a fiberglass pool mold is crafting the plug, which serves as the foundation for the mold. The plug is typically made from MDF wood due to its smooth surface and ability to be easily shaped and manipulated. This initial stage requires precision and attention to detail, as any imperfections in the plug will be transferred to the mold and ultimately to the pool shell itself.


Once the plug is constructed, the next step is to finish it to a glossy shine. This involves sanding, polishing, and applying multiple layers of gelcoat to achieve a smooth and reflective surface. The glossy finish not only enhances the aesthetic appeal of the mold but also plays a crucial role in ensuring that the fiberglass pool shell is smooth and free of any defects.


After the plug is polished to perfection, the final stage is to build the mold inside the plug. This process involves applying layers of fiberglass and resin to the plug, allowing it to cure and harden before removing the plug to reveal the mold. The mold must be carefully constructed to ensure that it accurately replicates the shape and dimensions of the plug, as any discrepancies will result in flaws in the pool shell.


Building a fiberglass pool mold is a labor-intensive and time-consuming task that requires patience, skill, and precision. The importance of creating a flawless plug cannot be overstated, as any imperfections will be magnified in the mold and ultimately in the pool shell.  Here at Midwest Container Pools we now build our own molds in house to control cost, timelines, and quality.  As the fall continues we will have updates on our new pool models we are working on.





By sheldon trieb April 17, 2025
If you’re thinking about putting in a pool, chances are you’ve looked at the usual options: concrete, vinyl liner, or fiberglass inground pools. But in recent years, a new contender has entered the scene— shipping container pools —offering a modern, durable, and often faster alternative to traditional builds. At Midwest Container Pools , we’ve helped homeowners across the U.S. bring their backyard dreams to life with our fiberglass-lined, spray foam-reinforced container pools . But is a container pool right for you? Or should you go the traditional route? Let’s break down the key differences in cost, installation, customization, durability, and long-term value to help you make the best decision for your home, your family, and your budget. 1. Installation Time Shipping Container Pools One of the biggest advantages of container pools is how quickly they can be up and running. Because the entire structure is pre-built off-site, you’re not stuck waiting for weeks of excavation or construction delays. Once your foundation and utilities are prepped, your container pool can be craned into place and filled with water in a matter of days. Traditional Inground Pools Traditional pools—especially concrete—can take 8 to 12 weeks or longer from start to finish. Excavation, forming, inspections, and weather delays can drag the project out, turning your backyard into a job site for months. 🟢 Winner: Container pools — They’re quicker, cleaner, and less invasive to your yard. 2. Cost Comparison Shipping Container Pools A fully finished container pool typically starts around $35,000 to $65,000 , depending on features like heaters, windows, steps, tile, and more. Because it's delivered as a complete unit, installation costs are predictable and generally much lower than a traditional pool. Traditional Inground Pools A basic vinyl liner pool may start around $40,000, but prices rise quickly with upgrades. Concrete pools can easily hit $80,000 to $100,000+ , especially once you factor in decking, landscaping, and maintenance costs. 🟢 Winner: Container pools — You get premium features for less, with fewer surprise expenses. 3. Durability & Construction Shipping Container Pools At Midwest Container Pools, we reinforce each unit with closed-cell spray foam and line it with fiberglass , which is incredibly strong, waterproof, and algae-resistant. The container shell itself is built to withstand extreme loads and weather conditions—it was originally made to survive ocean shipping, after all. Traditional Inground Pools Concrete pools are extremely durable but can crack over time and often require resurfacing every 10–15 years. Vinyl liners are more affordable but prone to tearing or fading. Fiberglass inground pools are smooth and long-lasting but require proper install or they may shift. 🟢 Winner: Container pools — Industrial-grade steel and advanced coatings offer long-term durability with minimal upkeep. 4. Customization & Design Shipping Container Pools While you're working within a standard size (typically 20’ or 40’), there’s still a lot of room for creativity. Our pools can be customized with: Built-in benches and tanning ledges Window cutouts and acrylic panels LED lighting packages Custom stairs and entry points Tile or plaster finishes Custom exterior cladding to match your space Traditional Inground Pools Concrete pools win when it comes to design freedom. You can go freeform, geometric, zero-edge—pretty much anything your budget allows. Fiberglass and vinyl pools are limited by mold shapes, but still offer some flexibility. 🟡 Winner: Tie — Traditional pools offer more shape options, but container pools can still be highly customized and make a bold visual statement. 5. Energy Efficiency Shipping Container Pools Our spray foam insulation makes a big difference. It helps trap heat, reduce energy costs, and maintain consistent water temperature longer—especially when paired with a solar or gas heater. Traditional Inground Pools Most inground pools, unless upgraded with insulation or a heat-retaining cover, lose heat quickly through the ground. Concrete in particular can be less efficient due to thermal loss. 🟢 Winner: Container pools — Built-in insulation gives them a major edge in efficiency. 6. Portability & Flexibility Shipping Container Pools This is a huge plus for container pools—they’re completely portable . If you ever move, you can take your pool with you. They can also be relocated on your property or even sold to someone else later. Great for homeowners who don’t want to make a permanent change. Traditional Inground Pools Once it’s in, it’s in. You can’t take it with you, and removing it can be a major expense. 🟢 Winner: Container pools — They’re versatile and future-proof. 7. Maintenance Needs Shipping Container Pools Thanks to the fiberglass lining, container pools are easier to clean and resistant to algae and stains. They don’t require resurfacing or liner replacements, and they typically use a compact filtration system that’s easy to service. Traditional Inground Pools Concrete and vinyl pools often require more frequent brushing, chemical balancing, and long-term maintenance. Vinyl liners may need to be replaced every 7–10 years, and concrete will eventually need resurfacing. 🟢 Winner: Container pools — Less maintenance means more swim time and fewer headaches. 8. Permit & Zoning Requirements Shipping Container Pools In many areas, container pools fall into a different category than traditional inground pools—sometimes considered modular or semi-permanent structures. This can mean fewer zoning restrictions and a faster permit process, but it varies by state and city. Traditional Inground Pools These usually require full permits, site plans, inspections, and sometimes even neighborhood approvals, all of which add time and cost. 🟢 Winner: Container pools — They often qualify for easier permitting, though always check with your local code office. So... Which Pool Is Right for You? If you want: ✅ Faster installation ✅ Lower upfront cost ✅ Easier maintenance ✅ Durable, long-lasting design ✅ Modern aesthetics ✅ Portability and flexibility Then a Midwest Container Pool might be the perfect fit. But if you're dreaming of a fully custom-shaped design, a large pool for diving or lap swimming, or you’re planning a luxury backyard remodel from scratch—then a traditional inground pool could be worth the extra investment. Either way, your pool should match your lifestyle, your space, and your budget . Why Choose Midwest Container Pools? We’re not just repurposing old containers. At Midwest Container Pools, we engineer every unit from the ground up using our background in swimming pool construction and spray foam technology. Our builds are: Reinforced with closed-cell foam for structural support and insulation Lined with fiberglass for a smooth, watertight, and long-lasting finish Custom-built by a team of experts with decades of pool experience Whether you’re in Florida, Texas, Arizona, or anywhere across the U.S., we ship nationwide and help you every step of the way—from planning to installation. Ready to Dive In? If you’re ready to take the plunge or just want to learn more about how a container pool compares to traditional options, we’re here to help. 👉 Contact Midwest Container Pools today for a free quote and start designing your dream pool the smart way.
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