Joined: July 2004
||Posted: 07 Jan. 2020,10:18
There's page after page after page of sealant advice on the main website, starting here plus a whole series of trials for various popular sealants.
However, no sealant will keep algae completely at bay, and you'll still need to clean it every year, whereas a top-notch biocide treatment, such as Wet and Forget, keeps it clean permanently, with just one or two watering-can applications per year. I've been using it on my heavily-shaded driveway for the last 5 years and while the charmless, gormless git next door persists with wasting a couple of hours every 6 months or so power-washing his half of the drive, my half remains completely algae-free, crisp and clean, and the power washer is covered in cobwebs in the back corner of the shed.....
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