can I use lead to seal an exhaust leak>

At the end of the day,frustration at its peak,what is your time actually worth?
I run out of patience swatting mosquitoes,not to mention filling pinholes. Use a steel tig filler rod (read coat hanger) while tacking with the mig. It works but in the end its a waste of time.
I send the tubework to the local shop,they can bend and install cheaper than i buy ready made pipes. As mentioned,here in manitoba the winged biting insects can get nasty. Two hands for welding, none left for swatting.