What grit range for paint rub down?

Going to rub down and respray my doors. What grit range would y'all in the know suggest to give a good key. Wasn't planning to rub down to bare metal.

Was thinking 400?

Depends what you're painting it with. Be prepared for a few different answers.

Discokids said:

Depends what you're painting it with. Be prepared for a few different answers.

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Will be painting with Upol primer and satin black from an aerosol.

320 for a good key for primer, then flatten primer with 800 or 1000 before applying paint.

Half a concrete block for the fine work and find something heavy for tough areas. Polish out with some hessian and loose gravel.

Oh no sorry thats for if your rolling in hammerite like @John03

payydg said:

Will be painting with Upol primer and satin black from an aerosol.

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For aerosol, ^what Clive says^. I usually use 180 but that's with 2k primer.

Thanks chaps. Just the info I was after

Also depends on the condition of the door. The person who painted mine before me slapped paint on with a brush and it was full of brush marks. I ended up with 180 then 240. Loads of high build then 400, using a DA. That after 2 coats of top coat i moved to hand sanding with 800, 1000, 2000. 2000 bit pointless as the body isn't super straight and dint free.