Hi Greg,
thanks for your review. I'm sorry to hear that you had to keep going over the same spot over and over again. I can assure you that this isn't the kind of experience that we want our customers to have. Although the Premium Plus Paint is a paint and primer in one, it may not block stains that are on the surface. At this point, it'll be best to use a stain-blocking primer to seal the surface and block the marker stains and any other stains, then recoat. For further assistance, please feel free to contact our customer care team directly - we'd be happy to help.
Best regards,
Takhari