Wonderseal Natural Clear Penetrating Oil Based SealerWonderSeal is a non silicone, penetrative sealant designed for use on porous natural surfaces. The product is actually a highly refined and polymerised aluminium compound in a turpentine base. This unique formulation allows the product to penetrate deep within the substrate whilst still allowing it to 'breath'. It is this unique principal that severely limits the formation of mould, moss and lichen growth while limiting the ingress of waterborne