I have a customer who has a fiber cement building with rust stains from water running out of a rooftop planter down the siding. I can scrub it off with a magic eraser, but the area is huge and 25+ ft. tall. My extension brushes don't have enough friction. I was hoping someone might give me some insight on using F9. I have just started using it this year, and have only done concrete so far. Can it be used on painted surfaces? Has anyone used it on fiber cement?
Gregg Giordano said
Oct 13, 2014
It can be used on painted surfaces, I'm not sure about fiber cement but my guess is yes no issues I would either do a small test spot and/or reach out to Craig from F9 he's always more then willing to assist.
Post some before and after pictures would love to see how it works out.
Good Luck.
AC Lockyer said
Oct 13, 2014
Yes you can use it on most everything. Just start weak and move up if needed.
I have a customer who has a fiber cement building with rust stains from water running out of a rooftop planter down the siding. I can scrub it off with a magic eraser, but the area is huge and 25+ ft. tall. My extension brushes don't have enough friction. I was hoping someone might give me some insight on using F9. I have just started using it this year, and have only done concrete so far. Can it be used on painted surfaces? Has anyone used it on fiber cement?
Post some before and after pictures would love to see how it works out.
Good Luck.
AC