I used so many things/methods,,,lol,,,not sure which one worked,,,I started with a flat soldering gun,,,then melted white pvc into the groove,,(that was on a tube video), ,I think that in the end,,,what solved all my cracks,,,there were many on the seems,(most on the gas tank side), ,,plus this cross seem crack...was liquid 2 part epoxy....
If I was to do it again...I would use the flat blade soldering tip first,,,and then the liquid epoxy.
Things that I learned, only use 1 support strap (the middle one,,,that tank is not going anywhere), when you reattach the tank after you are done, I firmly believe the pressure from the 3 straps bends the tank,,,since it doesn't use the softer plastic of earlier tanks,
I extracted the oil, and plugged the drain fitting,,,I left the oil sender in it, then using a compressed air gun, with a rag around it to stuff the hole of the filler hole, I would gently force air into the tank so that it would expand a bit,,,you will be able to see the tank expand and then contract again. any leaks would show up with the residue oil leaking out...and marked it with a black marker,,,I would work on each leak till it passed the compressed air test,
No need to clean the tank,,,that made the job 3 times harder, trying to get all the oil out,...you will use the residue oil to find the cracks. Of course you could also put dish detergent on top of the crack as well to look for bubbles.
