I was waiting for you to pop up!
Seriously though, waxoyl, is a readily available, fairly cheap, seemingly effective way of treating the chassis. And, you can easily do it yourself (no need to pay anyone...). I'm woring my way up my chassis with it - i just have some welding to do under the gearbox crossmember, so have only done the rear portion on the 110 behind the rear springs. It is very flammable, so make sure you do any remidial chassis work before spraying.