Anti corrosion spray

[evdama]

Any recommendations for a spray other than WD40/Gt85 
The van has come back from MOT with the sill coating damaged.
I cant prove it was them.
Id rather not use underseal if possible.
It would also be used under the bonnet nosing where the paint has bubbled off

[brodfather11]

I used something similar to Tetroseal wax /oil spray, it came with a long extension for the spray nozzle which I could push up box sections and spray. Cant find it now amazon or ebay but it did the job.

Even used it under the bonnet to seal a water leak , the underbonnet heat didn't affect it .

[evdama]

Thanks Bf
Ive found something that appears similar -Jenolite
Might give it a go.