---
product_id: 56575482
title: "Fiberglass Supply Depot Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins"
brand: "fiberglass supply depot"
price: "KSh6419"
currency: KES
in_stock: true
reviews_count: 8
category: "Fiberglass Supply Depot"
url: https://www.desertcart.co.ke/products/56575482-fiberglass-supply-depot-wax-additive-4-oz-surfacing-agent-use
store_origin: KE
region: Kenya
---

# faster curing & sanding tack-free surface finish 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:** KSh6419
**Availability:** ✅ In Stock

## Summary

> ✨ Seal the deal with a tack-free finish that means business! 🛠️

## 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?** KSh6419 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/products/56575482-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

- • **Time-Saving Finish:** Reduces post-cure cleanup and speeds up polishing, so you get project-ready results faster.
- • **Flawless Final Coat:** Eliminates sticky gelcoat surfaces for a smooth, sandable finish every time.
- • **Precision Dosage Control:** Optimized 4 oz per gallon ratio prevents defects like fish eyes or uneven texture.
- • **Oxygen Barrier Technology:** Wax migrates to surface, blocking oxygen and ensuring full cure to the edge.
- • **Professional-Grade Compatibility:** Works seamlessly with polyester resins and gelcoats—ideal for marine and composite pros.

## Overview

Fiberglass Supply Depot Wax Additive is a 4 oz surfacing agent designed to be mixed into the final gelcoat or polyester resin layer. It creates a tack-free, fully cured surface by migrating wax to block oxygen during curing, 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 streamlines finishing work, delivering professional-grade results with less hassle.

## 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: 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

- 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) — 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 — too much can cause defects like “fish eyes” or uneven finish.
- Catalyst still required: Wax additive doesn’t replace hardener — 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 | #23,945 in Automotive ( See Top 100 in Automotive ) #127 in Waxes |
| Customer Reviews | 4.6 4.6 out of 5 stars (332) |
| Date First Available  | November 15, 2017 |
| Is Discontinued By Manufacturer  | No |
| Manufacturer  | Eclipse |
| Package Dimensions  | 6.26 x 3.62 x 3.5 inches; 4 ounces |

## Product Details

- **Brand:** Fiberglass Supply Depot
- **Item Form:** Liquid
- **Item Weight:** 4 Ounces
- **Recommended Uses For Product:** For Polishing, For Paint Protection
- **Specific Uses For Product:** Surface Treatment, Sealant

## 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 November 8, 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 September 16, 2025*

Worked as expected, no issues.

### ⭐⭐⭐⭐⭐ Improved Packaging
*by K***O on October 27, 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)

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*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-03-01*