40 Condensation, mould, and damp treatment of building materials, namely brick, wood, stonework, concrete, timber, textiles and other constructional materials; condensation, mould, and damp treatment of plaster, stonework, concrete, timber to prevent ingress and absorption of water, destruction and repellence of insects, whether in ova, lava, pupa, or imago stage; treatment of building materials, namely brick, wood, stonework, concrete, timber, textiles and other constructional materials for the elimination and prevention of fungal infestations; sealing of plaster, stonework, concrete, timber and other constructional materials, namely, brick and mortar walls