If it works use it. For engines with hi boost or loose end gaps for NOS. you will see a seap at the seam. You will never get an oil leak at a case surface unless there is damage or warped. Just a wet seam over time. On Two strokes we raced it was a necessity or it would contaminate the trans oil running Methanol or a Nitro Methane mix . We would also have to glass bead the clutch steels and install new discs every race if the trans oil would get contaminated. We found case sealant worked the best for our application. . That gray material you see on all bike engines at the seams is Bonding paste. It also works great on cylinder studs when heli-coiled. But should the stud have to be removed it sucks . We raced all over the states at national events and most repairs were done on the road . We would also use it to glue torn gaskets in place if we didn't have one at the track. Try it you'll like it. Its not that expensive.