Prepping bodywork for paint

[Vidal Baboon]

Just need a few tips on what would be the best surface to start from.

I can either strip it back to bare metal, or would it be better to key the paint that is already there & apply to that?

What sort of grit sand paper would I need to key the bare metal?

[alsaautomotive]

If you are b/m'ing then there's a full rundown of the system we use on our website.......direct link here.........
http://www.alsaautomotive.co.uk/resprays.html
Hope this might be useful?
Best wishes, Al.