I use Denso a lot for work. There is a lot of misunderstanding about it, it is not just petrolatum tape but is a three part system. First there is a putty that is used to fill any voids, then the petrolatum infused hessian/sackcloth followed by an overwrap. From the photos of the motor the putty probably isn't needed to wrap the outside of the cylinder but I would recommend using the overwrap as well as the petrolatum tape. The overwrap is like a 100mm wide electrical tape that stops the petrolatum being washed out of the hessian over time.glossieblack wrote: ↑Tue Aug 03, 2021 5:04 am Muir recommended wrapping both the motor and gearbox in Denso petrolatum tape (Egyptian mummy style), while leaving the inlet and outlet openings of the air cooling fan's shroud unobstructed.
Using it on buried infrastructure we find that in some cases Denso only gives 5 years protection. Given how aggressive the marine environment can be I would add replacing the Denso every few years to the maintenance job list.