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Q: 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.

Q: 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.

Q: 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.

Q: 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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Description

🔧 Seal like a pro, drive with confidence!

ECONOMICAL RELIABLE - Hard setting formula offers a cost-effective sealant solution without compromising on quality or durability.
ENDURES EXTREME TEMPS - Works flawlessly from freezing -65°F to scorching 350°F, ensuring your gasket stays sealed no matter the climate.
FUEL FLUID RESISTANT - Built to withstand diesel fuels and most auto shop fluids, keeping your engine protected under pressure.
UNIVERSAL COMPATIBILITY - Seals all common gasketing materials, perfect for both import and domestic vehicles across all model years.
TRUSTED ORIGINAL FORMULA - Permatex’s classic Indian Head Shellac Compound—time-tested and trusted by pros for decades.

Permatex 20539 Indian Head Gasket Shellac Compound is a hard-setting, economical sealant designed for low temperature and pressure applications. It resists diesel fuels and most shop fluids, seals all common gasketing materials, and operates effectively within a temperature range of -65°F to 350°F. Ideal for both import and domestic vehicles, this trusted formula ensures durable, reliable gasket sealing for professional-grade vehicle maintenance.

Specifications

Brand	Permatex
Item Thickness	0.25 Inches
Color	Brown
Shape	Round
UPC	686226205391
Manufacturer	Permatex
Unit Count	1.0 Count
Global Trade Identification Number	00686226205391
Model	20539
Item Weight	1.6 ounces
Product Dimensions	1.25 x 3.69 x 1.25 inches
Item model number	20539
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	20539
OEM Part Number	20539
National Stock Number	8040-01-378-0235