POR-15 Self Etch Primer is the perfect solution for painting over top of cured POR-15 Rust Preventive Coating This terrific, high-tech coating will gently etch tough and glossy POR-15 Rust Preventive Coating, making the perfect surface for bonding with the paint of your choice Now you can use POR-15 for the ultimate protective coating, while also top coating with any color or type of paint POR-15 Self Etch Primer is engineered specifically as a bonding coat for POR-15 POR-15 41018 Self Etch Primer, 15 oz. Spray by National Tool Warehouse.