Hello

I'm after a bit of advice after finding my bike has an oil leak
After giving the bike a good clean up over the winter I found when I removed the belly pan that it was stained with oil. I have serviced the bike over the winter and have cleaned it all up to see if I can find the leak. It looks to be coming from a repair that has been done on the enging block. It has been repaired as the guy before me had a chain snap and damage the block. It looks like it has been repaired with some chemical weld. The leak is only enough to make 1 droplet a week on the bottom of the engine and im unsure what to do about fixing it. Can I put more chemical weld over the existing weld? Or shall I just make sure I keep the oil level correct and not worry about such a small loss?
Thanks Don