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 ?

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.

how much gelcoat will the 4oz treat

4oz will do 1 gallon of gelcoat. You would generally use 1oz per quart or 4oz per gallon.

can you use this with epoxy resin?

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 .

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?

Usually take a little flathead screw driver and poke the lid with it and it will pop out.

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Fiberglass Supply Depot Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins

Product ID: 543974805

Details

Brand
Fiberglass
Item form
Liquid
Specific uses for product
Surface
Recommended uses for product
For Polishing
Item weight
4 Ounces

📏118.29 ml capacity

🧪Liquid format

🛠️Tack-free finish

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€ 57.26

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

✨ Elevate Your Craft with Every Drop!

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.

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.

Specifications

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

Reviews

T**.

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.

8.11.2025

B**R

Good product

Worked as expected, no issues.

16.09.2025

K**O

Improved Packaging

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.

27.10.2025

J**G

High quality, fast delivery, good price

28.08.2025

K**�

If it serves a purpose ,

Works the way it should !

22.09.2025

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