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You're probably right mate. I also believe you're meant to have a spraying qualification to use stuff like this, reckon most people who do it ain't got it.He's spraying that all over the place wearing a short sleeved t shirt. You gotta to wear the right PPE and keep it off your body.
This is what roofers round here do, they do that because they will get repeat business IMO. A roof scraped needs to be done again in 12-18 months, if you treat it with biocide it will last for 3-5 years. The hard work is scraping the moss, the easy bit is spraying it and probably allows you to charge much more.If was to use a tower and Marshall scrapper, would that do a good enough job for a customer?