For years our customers have asked us for a thicker version of our world-famous POR-15 for filling seams or holes. Here it is! POR PATCH BLACK is, quite literally, POR-15 Rust Preventative Paint in a tube, & like POR-15 it dries as hard as a rock, remains flexible, & once dry is totally impervious to fuels & solvents. It's so tough it actually adds strength to weakened metal. & it won't absorb moisture & swell like conventional body fillers. Try it yourself, it's incredible! Apply Right Over Rust or Metal USE POR15 POR PATCH TO: Permanently seal seam Patch holes in steel, wood or plastics Repair loose furniture joints, concrete & cinder blocks Bond steel to plastic, wood or concrete Fix holes in fuel tanks Also Available in Black (S470 ). POR PATCH is a thick, pudding-like substance which acts as a total rust inhibitor & is also very effective as a metal filler. Por Patch can be easily brushed, or troweled. It chemically bonds to rusted steel to form a rockhard, non-porous coating that won't crack, chip, or peel. Because it is actually POR-15 in a thickened state, it works by isolating metal from moisture; without moisture present, steel can't rust. Por Patch is easier & less expensive to apply than epoxies because it doesn't require mixing. Since Por Patch actually bonds chemically to metal, the underlying surface does not have to be sanded before application. As long as loose or flaking rust is removed from the surface, an application of Por Patch will not only cover up the rust & prevent it from spreading, but will strengthen the underlying metal & seal holes by forming its own membranes. PORPATCH is a highly concentrated version of world famous POR-15 Rust Preventive Paint. Through new blending technology, we have added solids, reduced the solvent carrier, & homogenized the resulting blend into a thick, workable paste which can be troweled from a can or squeezed from a tube. A cured mass of Por Patch is virtually indestructible, yet it will remain flexible & won't crack or chip. Because i's non-porous, Por Patch can totally seal seams like no other product, & like regular POR-15, it can be applied directly to rusted surfaces. POR-PATCH is the ultimate filler. It hardens like steel, but won't chip or crack. It has the consistency of chocolate pudding & can be used to repair concrete & cinderblock. It will fi ll holes in steel, wood, plastic; it is waterproof & non-porous. As a moisture barrier, Por Patch is unsurpassed & its bonding characteristics to cured concrete far exceed those of cement & other patching compounds. It will not crack or fracture even when pounded on with the heaviest mallet! Por Patch is also a heavy-duty adhesive & can be used to bond plastic to steel or concrete or wood. Use Por Patch to repair broken, cracked concrete, cement walkways; dock maintenance: make waterproof patches to repair pre-formed concrete where moisture has penetrated through cement patches & caused rusting of rebar & expansion through freezing; waterproof concrete tanks, repair joints where railings have loosened from their concrete base. Por Patch is impervious to all fuels & can be used for exterior repairs to fuel tanks along with standard fuel tank repair. Por Patch dries to the touch in about 4 hours, but full cure may take 96 hours (4 days) or more, depending on the thickness applied.