Flex Seal was flexible but tore when bent too far. And although it sealed the crack in our flowerpot, we had to use two coats of spray paint to conceal our handiwork.
Mould can be very difficult to remove from silicone sealant but there is a natural product that can do the job in 10 minutes ...
As long as you're willing to wait for a calm, wind-free day, you should be able to direct the sealant spray away from ... To ...