I have a 2006 Tracker Fishin Deck aluminum boat and noticed the inside rear transom weld appears to be cracked. The boat has never leaked but concerned this may be the start of some big issues. I’ve not noticed this before so not sure if it’s new or has been there awhile. My question - what the best way to address? Do I need to find someone to weld, or can I use the JB marine weld to patch? Do I need to remove the paint from this area before repair? Can I put JB weld over the existing? Thanks.