I discovered today that I can scrape the white paint off fairly easily with a scraper:
I'm guessing that means that I need to scrape it off because it didn't really adhere to the layer beneath. Or am I wrong and will the primer "glue" this down as long as I can sand it to look like this?
I don't want to create more work for myself if I don't need to do this, but it seems like it probably needs to come off. I checked several places around the truck and it scrapes off easily everywhere.