using it to fill hairline cracks in fibreglass shower tray - can it be sanded, overpainted, and is it waterproof?

This is just a hardener. It is an additive for curing resin. It is not a resin itself. Thank you

does this work with big boy fibreglass

Hi Colin If you was originally supplied with red hardener with your product then this will do the job. Red hardener is used for a majority of fillers and fibreglass fillers. If need need any further information please do not hesitate to contact the Qpaints Team

Does this product garden resin jewellery and will it discolour the jewellery?

don't think so but depends on the resin you are using too. Alsodo a test run first.

Is this harder red or white in colour?

From memory its red but I used very little in the resin, so it did not really colour it. it did the job, but I did a test first to check that a small amount would harden the old resin I had.

Pack Of 2 40g Tube Red For 2k Body Fillers

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

🔧 Fix it right, fix it fast — the pro’s choice for flawless bodywork!

FIBREGLASS FRIENDLY - Perfectly formulated for polyester fillers and fibreglass repairs
PRO LEVEL VISCOSITY - High viscosity means less mess, more control, and a flawless finish
DUAL PACK CONVENIENCE - Two 40g tubes to keep your projects moving without interruption
TRUSTED QUALITY VALUE - Top-rated with 4.6 stars from 635 pros who demand the best
PRECISION HARDENING POWER - Dibenzoyl Peroxide paste ensures fast, reliable curing every time

This pack of two 40g red hardener tubes features Dibenzoyl Peroxide paste designed for use with 2K polyester body fillers, fibreglass repair fillers, and resins. Its high viscosity ensures smooth, controlled application, making it ideal for automotive body repairs. Trusted by professionals with a 4.6-star rating, it delivers reliable, fast curing and is compatible with fibreglass materials for versatile use.

Specifications

ASIN	B01FZ4D6IS
Batteries	2 C batteries required.
Best Sellers Rank	2,612 in Automotive ( See Top 100 in Automotive ) 43 in Fillers, Adhesives & Sealants
Brand	Hardener
Customer Reviews	4.6 4.6 out of 5 stars (635)
Date First Available	21 May 2016
Delivery information	We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Item Weight	100 g
Item model number	5010372702407
Manufacturer	Tetrosyl
Manufacturer part number	EXH001
Package Dimensions	12 x 6.2 x 2.5 cm; 100 g
Special Features	Fibreglass Compatible
Viscosity	High Viscosity

Reviews

B**N

Exalent

Exalent value and great quality Thank you

12.05.2026

J**S

Good quality hardener.

Works 100% with flexible (-for plastics), hard automotive fillers AND 2-pack wood filler. Sent super quick as well!

10.07.2026

S**E

Recommended

26.01.2026

S**M

Good quality

Good quality easy to use.

7.05.2026

M**K

Does the job

Does the job, good price, fast delivery.

27.07.2025

M**E

Works as it should

Hardens body filler as expected

24.04.2026

T**N

Very good

25.03.2026

A**R

Good value large tibe

Good value, large tube

24.10.2025

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Fantastic and great service. Shipping was faster than expected.

1 week ago

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TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

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

2 weeks ago