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, 2 oz.

Permatex 20539 Indian Head Gasket Shellac Compound, 2 oz.

Product ID: 13751203

Details

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

⛽Diesel & Fluids Resistant - durable chemical defense

🔥Flash Point 24.44°F - quick drying

🌡️Temp Range 65°F-350°F - versatile heat resistance

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Description

🔧 Seal the deal with the classic that pros trust!

CHEMICAL RESILIENCE - Resists diesel fuels and common shop fluids to maintain integrity
UNIVERSAL COMPATIBILITY - Seals all common gasket materials on import & domestic vehicles
ORIGINAL QUALITY FORMULA - Trusted sealant since 2004 for reliable gasket bonding
ECONOMICAL HARD SETTING - Cost-effective solution with a durable, hard-setting finish
WIDE TEMPERATURE TOLERANCE - Performs flawlessly from 65°F up to 350°F for diverse environments

Permatex 20539 Indian Head Gasket Shellac Compound is a hard-setting, economical sealant designed for low temperature and pressure applications. It offers a temperature range of 65°F to 350°F, resists diesel fuels and most shop fluids, and is compatible with all common gasket materials on both import and domestic vehicles. Trusted since 2004, it delivers reliable sealing performance for professional and DIY automotive maintenance.

Specifications

ASIN	B0008KLOG6
Best Sellers Rank	#23,478 in Automotive ( See Top 100 in Automotive ) #24 in Gasket Sealers #47 in Body Repair & Restoration Adhesives
Brand	Permatex
Customer Reviews	4.7 4.7 out of 5 stars (1,090)
Date First Available	July 7, 2004
Exterior	Machined
Is Discontinued By Manufacturer	No
Item Weight	1.6 ounces
Item model number	20539
Manufacturer	Permatex
Manufacturer Part Number	20539
Model	20539
National Stock Number	8040-01-378-0235
OEM Part Number	20539
Product Dimensions	1.25 x 3.69 x 1.25 inches

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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.

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