Self Etch Primer, 15 oz. Spray 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 41018 Yes - TITANIUM DIOXIDE (AIRBORNE, UNBOUND PARTICLES OF RESPIRABLE SIZE)