I question whether 6 ounces is needed to lube the seal. It seems that pouring in just enough to completely cover the bottom of the bowl would lube it.

I'm sorry to say this stuff was garbage. It was easier to just go buy a new seal than to waste the $ on this. Didn't even work a little bit.

do i pour in while the toilet has water in it or should the seal be dry?

Pour in with no water. Make sure valve is closed. Pour about a 1/4 of container if I remember correctly and leave overnight. Fixed my seal. Hasn't leaked since

Can it be used with valve lube or is this the same thing

The two products are compatible with one another and serve two different purposes. Toilet seal works in the bowl to keep the flush valve functioning . Valve lube goes straight into the blackwater (poo) tank and ALSO in the greywater (sink&shower) tank to prevent problems with the seals that keep the drain valves operational. I use both as preventive maintenance.

Does this work for the seal on cassette toilets?

This is not a sealant. It is simply advertised as a lubricant for sliding toilet parts. If you're using it as such....it should work

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Thetford Corp 36663 Toilet Seal Lube & Conditioner

Product ID: 340515168

Details

Brand
Thetford
Item form
Liquid
Number of Items
1
Specific uses for product
RV/Marine
Unit count
24 Milliliters

🚐Compatible with all RV & marine toilets

⚙️Silicone-based formula for seal longevity

🛡️Prevents waste buildup for smooth operation

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12248 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Keep your RV throne flawless — because smooth seals mean smooth journeys!

SAFE SUSTAINABLE - Petroleum-free and gentle on seals, protecting your investment while being eco-conscious.
DUAL USE CONVENIENCE - Perfect for both toilet seals and holding tank seals, simplifying your maintenance routine.
WASTE FREE OPERATION - Effectively prevents waste from sticking, guaranteeing smooth, hassle-free toilet function every time.
UNIVERSAL SEAL SAVIOR - Works seamlessly with all permanent and portable RV and boat toilets, ensuring no seal is left behind.
DEEP PENETRATION POWER - Silicone-based formula penetrates and conditions seals, extending their lifespan and preventing cracks.

Thetford Corp 36663 Toilet Seal Lube & Conditioner is a silicone-based, petroleum-free lubricant designed to penetrate and protect seals in all RV and marine toilets. It prevents waste buildup, extends seal life, and can be applied to both toilet and holding tank seals, ensuring reliable, smooth operation and long-lasting performance.

Specifications

ASIN	B002NSU0ZW
Best Sellers Rank	#28,120 in Automotive ( See Top 100 in Automotive ) #2 in RV Toilet Additives
Brand Name	Thetford
Container Type	Bottle
Contains Liquid Contents?	Yes
Customer Reviews	4.6 4.6 out of 5 stars (4,447)
Global Trade Identification Number	00028985366638
Item Form	Liquid
Item Weight	1.65 Pounds
Manufacturer	Thetford
Model Number	36663
Number of Items	1
Part Number	36663
Recommended Uses For Product	Marine
Specific Uses For Product	RV/Marine
UPC	028985366638
Unit Count	24 Milliliters

Reviews

R**S

This should stop the seal perishing over the winter when not in use

18.10.2024

R**E

Wow!!! This stuff is amazing! The toilet kept leaking water out of the bowl which made the camper stink. Used this once and it sealed it up!! Will be buying more!

6.05.2026

T**T

Can use sparingly. No need to dump a bucket in. Just cover the seal. Rejuvenated 20yr old seal in trailer. Seals great again and slides nice.

1.10.2025

R**T

Works great

26.04.2026

D**V

Shipped fast worked good

3.12.2025

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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How is product pricing calculated?+

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

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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12248 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered 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 Kyrgyzstan.

Secure transaction

Trustpilot

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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2 months ago

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