bollox to thirty seconds or spray n walk away, just mix 200ml janola or a bit more if using budget bleach, with 100ml sugar soap and 5L water in a napsack sprayer, give the roof a dousing of that ...leave for a day then waterblast from top to bottom, one sheet width at a time just like mowing the lawns but the view is better. kill rust system isnt the best, crc rust converter is (or equivlnt) just brush it on the rust (dont need to wire brush it) and watch it turn into a black undercoat (seriously)
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