Yes they are.
Example: I’ve had people come into the shop with their vehicles with blown head gaskets.
I quote them a price to repair the head gasket.
If they can’t afford the repair, or if the cost of the repair is more than the value of the vehicle, I then offer to add sodium silicate to the cooling system to seal the head gasket leak.
So they end up with a repair that costs less than $200.00, instead of $1000’s.
The vehicle is fixed, and it gives them time to find a replacement vehicle.