Got rust holes in your window sills? You need some POR-PATCH!
What is POR-15? Straight from the mouth of the manufacturer: POR PATCH™ is, quite literally, POR-15 in a tube, and like POR-15® it dries as hard as a rock, remains flexible, and once dry is totally impervious to fuels and solvents. Use it to fill small rust holes and gaps that you wouldn't try to fill with stiffer body fillers and putties. The consistency is much more manageable, like a residential caulking. Squeeze and spread. Easy!
• Available in 4 oz. tubes of white or black.