Stripping / Painting / Coating / Cleaning Rims

If i want to paint a seat post that is anodised, do i need to remove the anodising or just paint over the top with primer, i assume there is no need to remove the anodising but just want to check

PS - avoid the jokes of needing multiple cans to paint my seatpost

if you spray any seatpost, although you will only use a very small ammount, the overall width will increase slightly, therefore if your seatpost is a fairly tight fit in the frame, it a) either might not fit or be too tight, or b) you might scratch the crap out of your newly painted post [ooh.. er] when fitting.

Ollie