your being very helpful here. ill stay away from the salt.
and yes it is for a 700c road bike. the contact area on my rims isnt that small so i dont think that will be an issue. i am also aware that road brakes could be just as good but it works out being more expensive and im also partly doing it for the geekyness of it . ive also had so many different middle of the range brakes and they always start good but after the rim gets dirty and its raining etc they just dont work anywhere near safely.
now the locking was an issue i though of but that is why i am considering a water bleed. i dont know anyone that has done it so i only know what oil feels like. will the feeling be less instant and easier to modulate?