Is this good for a small outboard gearcase as a supplement to the seals ?

If it is being used to enhance the performance of gaskets, yes. You can also apply it around the outer metal edge of a seal before driving it into a casting. It should not be applied to the rubber part of a seal that contacts a rotating/moving part.

I want to use this on freeze plugs, but do you apply wet, or let the product dry before setting freeze plugs in place.

Put the product on wet, drive the plug in immediately after, smear excess around circumference of installed plug. Done.

Can you use this on transmission pan gaskets?

I don't see why not, but this hardens like a glue so on a paper or composition gasket you will have to tear it apart for next removal, leaving material on both sides that will have to be scraped off. Not fun! I use this on one side of a gasket, usually the machined/flat side and a non-hardening sealer on the other side, so when you take it apart, the gasket won't tear apart, and can be reused, with a fresh coating of non-hardening sealer. That is the plan anyway. It doesn't always work. My usual choice for non-hardening sealer is Aviation gasket sealer, such as Permatex #80017 or similar. It is rated up to 400 degrees F. I also use it like Anti-Size on bolts, Not Exhaust, to keep them from rusting. Keeps out the water.

Can I use this on a cylinder head gasket ?

back in the older years this was the go to stuff for head gasket sealers, but now a days most head gasket makers like felpro have the sealant already on the gaskets ( like printo seal or permatorque style gaskets) so you do not need any sealer just install and torque

Permatex 20539 Indian Head Gasket Shellac Compound 2 Oz

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Description

🛠️ Seal your legacy with the classic choice!

MADE IN THE USA - Crafted domestically for superior quality and trust
TOP RATED RELIABILITY - 4.7-star rating from over 1,000 users proves consistent performance
VERSATILE APPLICATION - Ideal for pumps, engines, and classic vehicle maintenance
VINTAGE GRADE SEALANT - Trusted by restorers to prevent leaks and ensure even gasket seating
PRECISION 2 OZ SHELLAC COMPOUND - Compact size for exact application and minimal waste

The 20539 Indian Head Gasket Shellac Compound is a 2 oz premium sealant designed for vintage pump and engine gasket restoration. Made in the USA by Permatex, it delivers a reliable, leak-proof seal trusted by professionals and hobbyists alike, boasting a 4.7-star rating from over 1,000 reviews.

Specifications

ASIN	B0008KLOG6
Best Sellers Rank	#21,425 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #24 in Fillers, Adhesives & Sealants
Brand	Permatex
Brand Name	Permatex
Country of Origin	USA
Customer Reviews	4.7 out of 5 stars 1,019 Reviews
Global Trade Identification Number	00686226205391
Item Shape	Round
Item Weight	1.6 Ounces
Manufacturer	Permatex
Model Number	20539
Part Number	20539
Shape	Round
UPC	686226205391

Reviews

K**R

Perfect Seal for Vintage Pump Restoration

Bought this for restoring a vintage pump assembly. It helped seat the gasket evenly and prevented minor seepage that was there earlier.

2.03.2026

西**孝

これが一番

昔からあるこれがやはり最高です。

2.12.2024

J**R

Good quality.

Works great.

8.06.2026

L**A

Permatex Gasket

I am buying this for the 2nd time, due to superior quality. You couldn't ask for a better product.

22.12.2025

M**K

Classic shellac

Used to adhere a main crank seal made of cork. Constant spinning and holding back motor oil there has been no noticeable leak.....this stuff is a beast!

13.12.2019

S**O

Esencial

Muy buen producto compraré más

7.05.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

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