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: 56575482

Details

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

⏱️Speeds finishing & sanding time

⚙️Wax migrates to surface for tack-free cure

🛥️4 oz perfect final coat dose

24585CFA

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Description

✨ Seal the deal with a tack-free shine! 🛥️

FLAWLESS FINAL FINISH - Eliminates sticky gelcoat surfaces for a smooth, sandable top coat
COMPATIBLE EASY TO USE - Mixes seamlessly with polyester gelcoat and resin, no extra bonding layers needed
PRECISION DOSAGE CONTROL - Optimized 4 oz per gallon mix ratio prevents defects like fish eyes
OXYGEN BARRIER TECHNOLOGY - Wax migrates to surface, blocking oxygen to ensure full cure
TIME SAVING SURFACING AGENT - Reduces post-cure cleanup and accelerates polishing for pro-grade results

Fiberglass Supply Depot Wax Additive is a 4 oz surfacing agent designed for the final gelcoat or polyester resin coat. It migrates to the surface during curing to block oxygen, preventing tackiness and enabling a fully cured, sandable finish. Ideal for marine and composite projects, it requires precise dosing (~4 oz per gallon) and must be used with MEKP catalyst. This additive streamlines finishing by reducing cleanup and enhancing polishability, delivering professional-grade results every time.

Specifications

ASIN	B077GYBNP1
Best Sellers Rank	#29,413 in Automotive ( See Top 100 in Automotive ) #150 in Waxes
Brand	Fiberglass Supply Depot
Brand Name	Fiberglass Supply Depot
Customer Reviews	4.7 out of 5 stars 370 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	4 Ounce

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