Hey guys. I'm new here to the forum. I just got a 1999 kx 125. 😃👍

It runs fine but on the side of the jug there is a hair line crack that antifreeze leaks out of. I know I should replace the jug but I just dumped a bunch of money into my LTZ and I got the kx for free. Not looking to spend too much money on it. It needs a few minor things but nothing to expensive. I'm wondering if I could just weld the crack. What kind of material is it made of?