--- 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: "181.52 DT" currency: TND in_stock: true reviews_count: 5 category: "Fiberglass Supply Depot" url: https://www.desertcart.tn/products/543974805-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use store_origin: TN region: Tunisia --- # Speeds up finishing time Compatible with gelcoat & polyester 4 oz perfect dosage Fiberglass Supply Depot Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins **Brand:** fiberglass supply depot **Price:** 181.52 DT **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Seal the deal with a flawless finish – no tack, all shine! ## 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?** 181.52 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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 - β€’ **Compatible & Efficient:** Works seamlessly with MEKP catalyst and most polyester resins - β€’ **Final Coat Only Formula:** Use exclusively in top coats to ensure full cure and surface hardness - β€’ **Precision Dosage Control:** Optimal 4 oz per gallon mix ratio prevents defects like fish eyes - β€’ **Oxygen Barrier Technology:** Wax migrates to surface, blocking oxygen for a flawless cure - β€’ **Tack-Free Finish Every Time:** Eliminates sticky surfaces for smooth sanding and polishing ## Overview Fiberglass Supply Depot Wax Additive is a 4 oz liquid surfacing agent designed to be mixed into the final gelcoat or polyester resin coat. It creates a tack-free, fully cured surface by migrating wax to the top layer, blocking oxygen and enabling easy sanding and polishing. Ideal for marine and composite projects, it requires precise dosing (about 4 oz per gallon) and must be used with MEKP catalyst. This additive enhances finish quality, reduces cleanup time, and is trusted by professionals for a smooth, durable surface. ## Description Gelcoat Wax Additive / Surfacing Agent – Tack-Free Cure & Easy Sanding This gelcoat wax additive is designed to be mixed directly into gelcoat or polyester resin to produce a hard, tack-free surface on the final coat. During curing, the wax migrates to the surface, sealing out oxygen and allowing the gelcoat to fully cure without surface stickiness. The result is a smooth, sandable finish that’s ideal for polishing, finishing, and cosmetic applications. Commonly used in marine, fiberglass, and composite projects, this surfacing agent is perfect for boat molds, repairs, and mold-made parts where a clean, professional finish is required. It should only be used in the final coat, as the wax barrier prevents further layers from chemically bonding unless sanded. Easy to mix and compatible with most polyester gelcoats and resins, this additive improves cure consistency and reduces post-cure cleanup time, making finishing work faster and more efficient. Typical mix ratio: Approximately 4 oz per gallon of gelcoat (adjust as needed). Note: MEKP catalyst is still required. Not recommended for laminating or build-up coats. Review: Makes gel, coat, dry and not sticky - This wax additive helped the Boat shine a bit more made the gel coat dry without a tacky filling. I recommend this product to be added to all gel coats. Whether they come with wax or not. 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. ## Features - Creates a tack-free surface: Wax additives mixed into gelcoat help eliminate the sticky surface caused by air exposure, allowing the gelcoat to cure fully and be sanded or polished once cured - Used only in final/top coats: Add the wax additive only to the final gelcoat layer (or final polyester resin layer) β€” do not add to intermediate layers that need bonding. - How it works: The wax (often paraffin or styrene-based) migrates to the surface during cure, forming a thin barrier that blocks oxygen and lets the resin cure hard all the way to the surface. - Dosage matters: Typical ratios are around 1 oz per quart or ~4 oz per gallon of gelcoat β€” too much can cause defects like β€œfish eyes” or uneven finish. - Catalyst still required: Wax additive doesn’t replace hardener β€” you still must add the correct amount of MEKP catalyst to gelcoat for polymerization to occur. - Terminology: These products are often called wax additive, surfacing agent, or surface seal for gelcoat/polyester resin. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B077GYBNP1 | | Best Sellers Rank | #107,175 in Sporting Goods ( See Top 100 in Sporting Goods ) #176 in Boat Maintenance Supplies | | Brand | Fiberglass Supply Depot | | Brand Name | Fiberglass Supply Depot | | Customer Reviews | 4.7 out of 5 stars 371 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/61YcXReONGL.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 ### ⭐⭐⭐⭐⭐ Makes gel, coat, dry and not sticky *by M***E on 22 July 2026* This wax additive helped the Boat shine a bit more made the gel coat dry without a tacky filling. I recommend this product to be added to all gel coats. Whether they come with wax or not. ### ⭐⭐⭐⭐⭐ 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 price *by J***A on 24 June 2026* Good product ## 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? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/543974805-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use](https://www.desertcart.tn/products/543974805-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-25*