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: 56575482

Details

Brand
Fiberglass
Item Form
Liquid
Item Weight
4 ounces
Recommended Uses For Product
For Polishing
Specific Uses For Product
Surface

⏱️fast tack-free curing

⚗️oxygen-blocking wax migration

🛥️4 oz perfect dosage

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Description

🛠️ Seal the deal with a tack-free, pro-grade finish!

FLAWLESS FINAL FINISH - Eliminates sticky gelcoat surfaces for a smooth, sandable topcoat.
TIME SAVING EFFICIENCY - Reduces post-cure cleanup and speeds up polishing and finishing workflows.
PRECISION DOSAGE CONTROL - Optimized 4 oz per gallon mix ratio prevents defects like fish eyes.
OXYGEN BARRIER TECHNOLOGY - Wax migrates to surface, sealing out oxygen for a fully cured resin.
PROFESSIONAL GRADE COMPATIBILITY - Works seamlessly with polyester gelcoat and resins—ideal for marine and composite projects.

Fiberglass Supply Depot Wax Additive is a 4 oz surfacing agent designed to be mixed into the final gelcoat or polyester resin coat. It migrates to the surface during curing, creating an oxygen-blocking wax barrier that ensures a tack-free, fully cured, and sandable finish. Ideal for marine and composite applications, it requires precise dosing (4 oz per gallon) and must be used with MEKP catalyst. This additive streamlines finishing by preventing sticky surfaces and reducing cleanup time.

Specifications

ASIN	B077GYBNP1
ASIN	B077GYBNP1
Best Sellers Rank	#45,449 in Automotive ( See Top 100 in Automotive ) #199 in Waxes
Brand Name	Fiberglass Supply Depot
Customer Reviews	4.7 4.7 out of 5 stars (381)
Date First Available	November 15, 2017
Item Form	Liquid
Item Weight	4 ounces
Manufacturer	Eclipse
Manufacturer	Eclipse
Number of Items	1
Package Dimensions	6.22 x 3.7 x 3.43 inches; 4 ounces
Recommended Uses For Product	For Polishing, For Paint Protection
Specific Uses For Product	Surface Treatment, Sealant
UPC	819794020329
Unit Count	4 Ounce

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$37.15

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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