It is formulated to penetrate by diffusion into the timber, while still allowing the surface to be painted over. It can also be used to kill surface mould, algae or fungi. You can use No Rot Gel on timber, masonry or concrete surfaces.
No-Rot Gel can be painted over, used indoors or outdoors (but must be painted over) and will penetrate through patches of decay killing it and treating the sound wood behind it.
Available in 1L, 5L, 10L, and 20L.