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

Corp 36663 Toilet Seal Lube And Conditioner

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚽 Keep your RV throne leak-proof and fresh—because every journey deserves smooth sailing!

DUAL USE CONVENIENCE - Perfect for both toilet seals and holding tank seals—one product, multiple solutions.
TRUSTED BY THOUSANDS - Highly rated with 4.6 stars from over 4,400 users who swear by its reliability.
ALL IN ONE SEAL SAVIOR - Works seamlessly with all RV and portable toilets for ultimate versatility.
LONG LASTING SEAL PROTECTION - Silicone-based, petroleum-free formula extends seal life safely and effectively.
SMOOTH LEAK FREE PERFORMANCE - Prevents waste from sticking, ensuring flawless toilet operation every time.

Thetford Corp 36663 Toilet Seal Lube & Conditioner is a silicone-based, petroleum-free liquid designed to lubricate and protect seals in RV and marine toilets. Compatible with all permanent and portable toilets, it prevents waste buildup and extends seal life, ensuring smooth, leak-free operation. Trusted by thousands, it’s a must-have for maintaining your mobile bathroom’s performance.

Specifications

ASIN	B002NSU0ZW
Best Sellers Rank	#48,844 in Automotive ( See Top 100 in Automotive ) #3 in RV Toilet Additives
Brand	Thetford
Brand Name	Thetford
Container Type	Bottle
Contains Liquid Contents?	Yes
Customer Reviews	4.6 out of 5 stars 4,459 Reviews
Global Trade Identification Number	00028985366638
Item Form	Liquid
Item Weight	1.65 Pounds
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
Specific uses for product	RV/Marine
UPC	028985366638
Unit Count	24 Milliliters
Unit count	24 Milliliters

Reviews

R**S

Toilet valve lubricat

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

18.10.2024

R**E

Best out there, really works!

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

Rejuvenated old seal

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

Great Product

Works great

26.04.2026

D**V

It works pretty well

Shipped fast worked good

3.12.2025

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