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

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

Product ID: 644303120

Details

Brand
Fiberglass
Item Form
Liquid
Specific Uses For Product
Surface
Recommended Uses For Product
For Polishing
Item Weight
4 Ounces
Number of Items
1

🔄Continuous mixing needed

🧪4 oz precise dosing

⚗️Compatible with gelcoat & polyester

€ 82.40

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Description

🛠️ Elevate your fiberglass game with a smooth, pro-grade finish!

SEAMLESS COMPATIBILITY - Works effortlessly with both non-waxed gelcoat and polyester resins for versatile application.
MIX IT RIGHT MIX IT TIGHT - Designed to separate after addition, so thorough mixing guarantees consistent performance.
TACK FREE FINISH EVERY TIME - Ensures your gelcoat and polyester dry smooth and non-sticky, perfect for flawless fiberglass projects.
TRUSTED BY PROS LOVED BY DI YERS - Backed by a 4.6-star rating from 350+ users who demand quality and reliability.
PRECISION DOSING FOR OPTIMAL RESULTS - Use exactly 4 oz per gallon to achieve the ideal surfacing effect without guesswork.

Fiberglass Supply Depot Wax Additive is a 4 oz liquid surfacing agent designed to be mixed with gelcoat and polyester resins. It ensures a tack-free, smooth finish by preventing stickiness during curing. Ideal for professional and DIY fiberglass refinishing projects, it requires precise dosing and thorough mixing for best results. Made in the USA and highly rated by users, it’s a must-have for flawless surface treatment and sealant applications.

Specifications

ASIN	B077GYBNP1
Brand	Fiberglass Supply Depot
Brand Name	Fiberglass Supply Depot
Country of Origin	USA
Customer Reviews	4.6 out of 5 stars 353 Reviews
Item Form	Liquid
Item Weight	4 Ounces
Manufacturer	Eclipse
Number of Items	1
Recommended Uses For Product	For Polishing, For Paint Protection
Specific Uses For Product	Surface Treatment, Sealant
UPC	819794020329
Unit Count	113.3981 Grams

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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TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Fantastic and great service. Shipping was faster than expected.

1 week ago

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€ 82.40

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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