I'm thinking about getting some holes / nipples set up for injecting rustproofing into the chassis rails, sills etc so I can easily get some fish oil into those hidden spots regularly. I have heard there is a new product which flows like fish oil but sets waxy and does not break down over time like fish oil.
I would appreciate any suggestions re the best way to go.
I think it is called cavity wax, Alfio, aka (the love god) may be able to advise you.