Had a small leak on my XTZ750
Used Plastic Paddings " Leak Fix" good for petrol and sets in 10 mins
Took the tank off and stood it in the sun, leak pointed at the sun.
Went to Halfords and bought the product £4.79, plus a pencil with a fibreglass tip, used to abrade the surface around the leak to remove paint and make sure you get back to shiny metal, and that the area is DRY and free from petrol.
Mixed up Leak Fix and applied 10mins later the job's a gud un