Sure is, you’ll probably just want to do less of an area than normal in one go, I.e split the render up and do half at a time.
Having said that, I did a render clean the other day in 33c heat, was amazed how well it worked given the mix had dried by the time I rinsed it.
Went over it a second time and the black fungus staining faded over the course of an hour. Hypo just keeps working, even when it’s seemingly dried out. It’s still killed the organic matter and will still work as it does on cooler days.
