I need a little guidance on how to proceed with this project. I have sandblasted but can’t get all of the small, black specks out of the pitting. So, I want to use Eastwood Rust encapsulator. I am using a ppg etch primer and Eastwood states that the rust encapsulator is not compatible under the etch primer. My question is,”can I spray the etch primer and then spray the rust encapsoluator on the pitting, and then shoot with ppg primer surfacer?