Custom Fiberglass & Silicone Mold Manufacturing , just 15 Minutes from San Diego, CA

US-quality tooling at Baja California prices. Save up to 60% on custom molds with 1–2 week turnaround and free delivery FOB San Diego, CA.

Molds.mx builds production-grade fiberglass and silicone molds for manufacturers, product developers, and fabricators across the United States. Located in Baja California, Mexico — only 15 minutes from the San Diego border — we combine skilled composite tooling craftsmanship with nearshore pricing that cuts your mold costs by as much as 60% compared to US shops, without the 6–8 week ocean freight, tariffs, and communication delays of sourcing from overseas.
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The Smart Alternative to US Prices and Overseas Delays

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Nearshore savings, next-door speed. US mold shops charge premium labor rates. Chinese tooling means 30–45 days on the water, tariff exposure, and time-zone communication gaps. Molds.mx gives you the best of both: skilled Mexican composite technicians at a fraction of US labor cost, in the same time zone, a 15-minute drive from San Diego. Visit our shop in the morning and be back for lunch.
Free delivery, FOB San Diego, CA. Every mold ships free to San Diego. Your freight costs, risk, and logistics start stateside — no international shipping headaches, no customs surprises. USMCA-qualified goods mean duty-free import.
Most affordable — up to 60% savings. Same materials (tooling gel coats, ISO/vinyl ester resins, platinum-cure silicones), same processes, dramatically lower overhead. Put the savings into more cavities, more iterations, or your bottom line.
Quick turnaround. Most fiberglass and silicone molds are completed in 1 to 2 weeks. Rush and emergency services available for time-critical projects.
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Top 10 Frequently Asked Questions by Molds.mx

1. How much does a custom mold cost?
Custom mold pricing depends on size, complexity, cavity count, and material. Silicone molds typically range from $100–$500 for small, simple parts up to $1,000–$5,000+ for large or multi-part molds. Fiberglass production molds generally run from a few thousand dollars for small parts to five figures for large multi-part tooling like boat hulls. Because our shop is in Baja California, Molds.mx prices average up to 60% below comparable US quotes. Send your files or part for a free quote within 48 hours.
2. What's the difference between a fiberglass mold and a silicone mold?
Fiberglass molds are rigid, durable tools best for large parts and long production runs—boat hulls, body panels, tubs, and tanks. Silicone molds are flexible, capture extreme detail, and release undercuts easily — ideal for resin, concrete, plaster, wax, and prototype casting. Fiberglass molds last hundreds to thousands of pulls; silicone molds typically last dozens to a few hundred depending on the casting material. We build both and will recommend the right tool for your part, volume, and budget.
3. How long does it take to make a custom mold?
Most molds at Molds.mx are completed in 1 to 2 weeks from plug approval. Simple silicone molds can be faster; large multi-part fiberglass molds may take longer. Rush service is available for time-critical projects, and because we're 15 minutes from San Diego, there's no ocean transit added to your lead time.
4. How many parts can a mold produce before it wears out?
A well-built fiberglass mold with tooling gel coat, properly waxed and maintained, can produce hundreds to thousands of parts over many years. Silicone molds typically yield 25–100+ castings depending on part geometry and the resin or material being cast (abrasive or exothermic materials shorten life). We build molds to your expected production volume and offer repair and refurbishing to extend service life.
5. What do you need from me to get a quote?
Any of the following: a 3D CAD file (STEP, IGES, STL), 2D drawings, photos with dimensions; or simply ship us the physical part. Our tooling designers can work from a sketch and build a 3D model or reverse engineer an exact mold from an existing part. Quotes are free and typically returned within 48 hours.
6. Can you make a mold from an existing part?
Yes. Reverse engineering is one of our core services. We prep your original part as the plug (filling, sealing, polishing, adding draft and flanges), then build a fiberglass or silicone mold that reproduces it exactly. Common projects: discontinued auto body parts, boat components, housings, decorative elements, and legacy parts with no drawings.
7. Is it cheaper to have molds made in Mexico?
Yes — significantly. Mexican composite tooling labor costs a fraction of US rates, which is where most of a mold's cost lives. Unlike sourcing from China, there's no ocean freight, no 30–45 day transit, no Section 301 tariff exposure, and no time-zone barrier: USMCA trade rules allow duty-free import, and our shop is a 15-minute drive from San Diego. Customers typically save up to 60% versus US quotes with comparable materials and quality.
8. What does "Free delivery FOB San Diego, CA" mean?
FOB (Free On Board) San Diego means we handle and pay for everything border crossing, customs, and transport  until your mold is delivered in San Diego, California. From that point you take possession, so there's zero international shipping cost or risk on your side. Pick it up locally or we'll help arrange freight anywhere in the US.
9. What materials do you use for your molds?
Fiberglass molds: tooling gel coat (15–20 mil), chopped strand mat and woven reinforcements, ISO polyester or vinyl ester tooling resins chosen for low shrinkage and dimensional stability; epoxy tooling available for critical-tolerance work. Silicone molds: tin-cure and platinum-cure RTV silicones, including food-safe grades, with rigid fiberglass mother molds for large brush-on molds. Every mold passes dimensional inspection before delivery.
10. Do I own my mold, and is my design protected?
Yes. You own the tooling you pay for — pick it up, store it with us at no charge, or move it anytime. We work under NDA on request and never reproduce customer tooling or parts for anyone else. Tool history and maintenance records are documented for every mold we build.