I'd say, go for a spray primer, especially on a model with so much smooth space on it. I'd also recommend avoiding the Vallejo spray primer for this, I found it also reacted to the Prodos material by curing to a sticky finish that I had trouble keeping on. Army Painter black spray is very good when it's good, but can be a little unreliable. Citadel is stupidly expensive, but I've also never had problems with it for resin models.