What are new body panels coated in?

So I've just had some new Defender rear panels delivered. They are OEM quality from our favorite blue box company.
Aside from having no holes for the fog/reversing lights they came with a thin coat of black paint. So does this paint have to be completely removed before primer and top coat or is it good to take the primer?
Cheers

Just key the black primer with 320 then panel wipe & your good to go for your primer.

kevstar said:

Just key the black primer with 320 then panel wipe & your good to go for your primer.

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Winner, cheers. That'll save a whole lot of effort

stoney424 said:

Winner, cheers. That'll save a whole lot of effort

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I had a vision of you sanding all the black primer off lol
post some pics of your repairs lz love piccys

kevstar said:

I had a vision of you sanding all the black primer off lol
post some pics of your repairs lz love piccys

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Oh that would have been awful. I've a wet blaster on order so would have used that if need be.
Pics will be posted in due course

I must admit that I remove it. I've often found this pain isn't bonded to the steel correctly, so can flake off if it's impacted by a stone. I use paint stripper to remove it (only the colour coat side), before keying the panel correctly, then applying a decent primer. The underside will get a coat of stone chip protection, or wax depending on the panel being fitted.