Thread Sealant for Coolant Parts?

I always use the store brand. It's normally a dollar or more cheaper than the name brand and I am sure made by the same company. The red is the high temp.

I'm with you Rob
There are certain things I will use teflon tape on, like water pump nipples.
But red RTV is the king about everywhere else.
BTW, the red stuff also dries firmer than any of the other variations.
Seems to me all those other types (Ultra blue, Ultra black) that are supposed to be for sealing oils don't work as good as the red High Temp even on oil.
Plus the Ultra's are way softer when dry.

Intake to block china rail
Manifold to heads bolts
Wet studs in heads
water pump to block sealing surface
water pump to block bolt threads
Oil pan gasket
Oil filter plate gaskets
Valve covers
Main bearing cap to block
crank nose to balancer
And lots more.

Been using it for decades for all the above stuff.

Some people put way more than needed on, but this is the killer stuff right here.

RTV.jpeg