I tried the suggestion of peeing into the coolant... :fencelook:
...so thanks to Zack, who suggested I pee in the coolant, I am now at hospital with 3rd degree burn wounds on my penis!! :shocked:
This was from the radiator cap that flew open under pressure, and sprayed me with boiling steam and coolant... ~)
I have now decided that my car and engine is in a strong enough condition, and I will never again attempt this pee-strengthening technique... :nonono: