Neutral Silicone: One component, solvent-free silicone sealant, with neutral alcoholic cross-linking, low modulus. Cured by atmospheric humidity, forming an elastic, adhesive seal. Recommended for use by tinsmiths in general and in traditional building for sealing porous and non-porous materials: concrete, plaster, masonry, copper, steel, aluminium, galvanised sheet, glass, ceramic, wood, ABS, rigid PVC, polycarbonate, painted substrates, mirrors. Not over-paintable.