If you paint Hammerite on clean steel, it'll be temporary anyway
It has no etch properties of it's own and relies on getting a key from the rust.
Hammerite's crap anyway IMHO, it used to be decent stuff years ago, but now they've had to (as have most industries) change the environmentally unfriendly chemicals in it to bunny-friendly ones, it doesn't work so well
Ah
What do you reccomend the best for temporary cover? (3months+ outside)
Thanks