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

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Permatex 20539 Indian Head Gasket Shellac Compound

Permatex 20539 Indian Head Gasket Shellac Compound

Product ID: 13751203

Details

Brand
Permatex
Color
Brown
Item Thickness
0.25 Inches
Material
solid
Shape
Round

⏳Sets hard for durable sealing

🔥Flash Point 24.44°C - heat resistant

🛠️Compatible with all common gasket materials

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164 DH

Duties & taxes included

In stock

Sold byAmazon MoroccoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Permatex
Color
Brown
Item Thickness
0.25 Inches

Description

🛠️ Seal like a pro, drive with confidence!

ENDURING HEAT SHIELD - Operates reliably from 65°F to 350°F, perfect for diverse engine conditions
FUEL FLUID DEFENDER - Resists diesel fuels and most shop fluids to keep seals intact
COMPACT READY TO USE - 2 oz. solid shellac compound, easy to apply and store
UNIVERSAL COMPATIBILITY - Works seamlessly on both import and domestic vehicles of any model year
CLASSIC FORMULA PROVEN PERFORMANCE - Trusted original recipe since the 70s for unbeatable sealing power

Permatex 20539 Indian Head Gasket Shellac Compound is a hard-setting, economical sealant designed for low temperature and pressure applications. It withstands temperatures from 65°F to 350°F and resists diesel fuels and common shop fluids. Compatible with all common gasket materials, this 2 oz. brown shellac compound is a trusted classic formula favored by professionals and DIYers alike for reliable, durable sealing on both import and domestic vehicles.

Specifications

ASIN	B0008KLOG6
Best Sellers Rank	#25,236 in Automotive ( See Top 100 in Automotive ) #29 in Gasket Sealers #53 in Body Repair & Restoration Adhesives
Brand	Permatex
Brand Name	Permatex
Color	Brown
Customer Reviews	4.7 out of 5 stars 1,067 Reviews
Global Trade Identification Number	00686226205391
Included Components	Permatex 20539 Indian Head Gasket Shellac Compound, 2 oz.
Item Shape	Round
Item Thickness	0.25 Inches
Item Type Name	Permatex 20539 Indian Head Gasket Shellac Compound, 2 oz.
Item Weight	1.6 Ounces
Manufacturer	Permatex
Material	solid
Material Type	solid
Model	20539
Part Number	20539
Shape	Round
UPC	686226205391
Unit Count	1.0 Count
Warranty Description	As labelled

Reviews

R**K

7.04.2026

W**L

28.02.2026

F**S

28.03.2026

N**.

2.04.2026

G**E

13.10.2025

H**T

9.12.2025

M**N

26.02.2026

L**S

4.03.2026

西**孝

2.12.2024

K**R

2.03.2026

L**A

22.12.2025

M**K

13.12.2019

R**O

30.07.2025

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164 DH

Duties & taxes included

In stock

Sold byAmazon MoroccoDelivered 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 Morocco.

Secure transaction

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