That's Permatex Form A Gasket 1 Mark. It's tough stuff!
Permatex® Form-A-Gasket® No. 1 Sealant
Fast-drying, hard-setting sealant designed for sealing rigid materials and flanges, or patching holes and joints where permanent assembly is desired. Temperature range -65°F to 400°F (-54°C to 204°C); resists common shop fluids and fuels.
Suggested Applications: Freeze plugs, threaded connections, manifold gaskets
HondaBond and YamaBond are both essentially Three Bond 1194 Liquid Gasket (Grey)
ThreeBond 1194 is a semidrying liquid gasket whose major component is special synthetic rubber. After it is applied and dried, it will form a rubber-like elastic body. Since it excels in padding property, it shows a high sealing effect on bonded surfaces that have poor flatness and large clearance. In addition, it has excellent resistance to water, oil and gasoline.
High padding property
It shows an excellent sealing effect not only on normal bonded surfaces, but also on
Bonded surfaces with large clearance.
Excellent resistance to vibration and impact
After applied and dried, it will form a rubber-like elastic body and exhibit excellent
Resistance to vibration and impact.
Excellent resistance to high and low temperatures
It keeps stable rubber elasticity in a wide temperature range from -40°C to 150°C.
Excellent resistance to water and oil
Effective in preventing leak from threaded portions
Sealing of flange surfaces and threaded portions
Applicable to sealing of flange surfaces having large clearance
For sealing other coolants.