--- product_id: 543974805 title: "Fiberglass Supply Depot Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins" brand: "fiberglass supply depot" price: "€ 57.26" currency: EUR in_stock: true reviews_count: 5 category: "Fiberglass Supply Depot" url: https://www.desertcart.hr/products/543974805-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use store_origin: HR region: Croatia --- # 118.29 ml capacity Liquid format Tack-free finish Fiberglass Supply Depot Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins **Brand:** fiberglass supply depot **Price:** € 57.26 **Availability:** ✅ In Stock ## Summary > ✨ Elevate Your Craft with Every Drop! ## Quick Answers - **What is this?** Fiberglass Supply Depot Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins by fiberglass supply depot - **How much does it cost?** € 57.26 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/543974805-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use) ## Best For - fiberglass supply depot enthusiasts ## Why This Product - Trusted fiberglass supply depot brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Perfectly Measured:** Each 4 oz bottle is designed for optimal mixing with a gallon of gelcoat or polyester. - • **Professional Quality:** Crafted for the discerning DIYer and professional alike, ensuring top-tier results. - • **Seamless Integration:** Easily blends into your existing materials for a smooth application. - • **Stay Ahead of the Curve:** Join the ranks of elite creators who trust Fiberglass Supply Depot for their surfacing needs. - • **Transform Your Projects:** Achieve a flawless, tack-free finish with every application. ## Overview The Fiberglass Supply Depot Wax Additive is a 4 oz surfacing agent designed to enhance gelcoat and polyester resin applications. This liquid additive ensures a tack-free finish when mixed properly, making it an essential tool for both professionals and DIY enthusiasts looking to achieve high-quality results in their fiberglass projects. ## Description 4 oz wax additive for gelcoat and polyester resins. Review: Worked Perfect. - Good product for working with fiberglass. It works well when blended together with polyester resin or gel coat to cure it to a non sticky texture. I used it when I refinished the fuel tank area in my Champion DCX 221 Elite bass boat. Review: Good product - Worked as expected, no issues. ## Features - Use 4 oz of surfacing agent per gallon - When added to non-waxed gelcoat or polyester it will make it dry tack-free - Make sure to mix well as this continues to separate once added to your product. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B077GYBNP1 | | Best Sellers Rank | #60,976 in Sporting Goods ( See Top 100 in Sporting Goods ) #92 in Boat Maintenance Supplies | | Brand | Fiberglass Supply Depot | | Brand Name | Fiberglass Supply Depot | | Customer Reviews | 4.6 out of 5 stars 353 Reviews | | Item Form | Liquid | | Item Weight | 4 Ounces | | Item form | Liquid | | Item weight | 4 Ounces | | Manufacturer | Eclipse | | Recommended Uses For Product | For Polishing, For Paint Protection | | Recommended uses for product | For Polishing, For Paint Protection | | Specific Uses For Product | Surface Treatment, Sealant | | Specific uses for product | Surface Treatment, Sealant | | UPC | 819794020329 | | Unit Count | 118.29 Milliliters | | Unit count | 118.29 Milliliters | ## Product Details - **Brand:** Fiberglass Supply Depot - **Item form:** Liquid - **Specific uses for product:** Surface Treatment, Sealant - **Recommended uses for product:** For Polishing, For Paint Protection - **Item weight:** 4 Ounces ## Images ![Fiberglass Supply Depot Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins - Image 1](https://m.media-amazon.com/images/I/61SL8RwUfAL.jpg) ## Questions & Answers **Q: Can you pre-mix this with a quart of non-waxed gelcoat to effectively make it waxed gelcoat? and use as much as you need out of the an with mekp ?** A: Yes you can do that. If you need to do two coats do the first one with no wax then add your wax to the last coat. That way you don't have to sand in between coats. **Q: how much gelcoat will the 4oz treat** A: 4oz will do 1 gallon of gelcoat. You would generally use 1oz per quart or 4oz per gallon. **Q: can you use this with epoxy resin?** A: I use this for gelcoat on a bass boat , Gel coat will not cure to a hard finish unless seal from outside air , it will stay tacky, you mix this in with a batch and during the process of curing it comes to the surface and seals it and allows it to harden properly, I dont think you need it with epoxy resin because it hardens without it . **Q: The top of the can is sealed with a metal cap and says to cut this out. What's the best way to do this?** A: Usually take a little flathead screw driver and poke the lid with it and it will pop out. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worked Perfect. *by T***. on 8 November 2025* Good product for working with fiberglass. It works well when blended together with polyester resin or gel coat to cure it to a non sticky texture. I used it when I refinished the fuel tank area in my Champion DCX 221 Elite bass boat. ### ⭐⭐⭐⭐⭐ Good product *by B***R on 16 September 2025* Worked as expected, no issues. ### ⭐⭐⭐⭐⭐ Improved Packaging *by K***O on 27 October 2025* Yes, off gassing made me nervous but in the three years since the below review, they have significantly improved their packaging - sealed bag and even the can has a metal seal under the screw top that you have to cut open —>. “ If you can't seal dangerous liquids, don't try and sell them. This has never been opened, not even the plastic. I can tell that there's about half of a jar remaining by feel. And you better believe it stinks up anywhere it lives for a 25 ft radius. ## Frequently Bought Together - Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins - TotalBoat-488419 Marine Gelcoat for Boat Building, Repair and Composite Coatings (White, Quart No Wax) - TotalBoat Polyester Laminating Resin - Marine Grade Fiberglass Resin and MEKP Catalyst for Layups and Repairs (Gallon) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/543974805-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use](https://www.desertcart.hr/products/543974805-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-09*