Quite interesting. Some Toyota gaskets seem to have sealant on them. Noticed this when tried to clean the gasket and some of it cleaned right off. I thought it would be better to get new ones.
The sealant, whatever it is, is dull gray and if wiped off, underneath it there is shiny black metallic surface.
Now I understand why some of the gaskets are non-reusable. Anyone know if the sealant is heat activated?
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