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Does GW colored sparys work as a primer for the model? The same way as chaos black or corax white?

I get a little confused as the description of them is different

The Clolored sprays say: "Macragge Blue Spray is designed for basecoating all Citadel miniatures. When sprayed over an undercoat, it's a fast way to get a uniform base of colour onto your models."

And the black/white says: Citadel Colour spray cans are designed for undercoating metal and plastic models. The purpose of the undercoat is twofold: it acts as a primer and it provides a flat base colour to paint onto.

Previous discussion on the topic.

https://www.dakkadakka.com/dakkaforum/posts/list/737815.page

I've used the Death Guard Green spray over grey plastic and it's worked very well for me. As always with basecoating with a spray, it's better to go over in the model in short bursts in a sideways motion instead of holding the spray down in one location.