It is used on the North Sea oil
rigs, I have used it in several similar engine room environments and seems to work well, keep misting with fresh water
once applied to keep it active for 24 hrs, then wash any residual, leave for a few days.
Any rust that shows after that period - reapply, repeat until no rust reappears.You don't need to paint
over but if you want to I would recommend leaving unsealed for a few weeks until all rust has been converted before you do
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.......i apologise for the auto corrects !!!