Before jumping in with both feet, I would recommend looking at the complete paint job as a whole for inter-compatibility. Just because someone has used it with good results does not mean you will experience the same results if you are using different paint products. If there are compatibility issues with what you are spraying directly over the Ospho, there stands a good chance to risk adhesion failure and thus paint failure down the road. To my knowledge, both House of Kolor and SPI epoxy primers are not compatible, there may be others. So prior to using an Ospho type product, insure it is compatible with your primer you plan on using (verify to the product data sheets). Otherwise you may be money ahead to find another method of prepping the panel that won't cause adhesion issues with your paint.
