down to bare metal will end up costing more in product since you will have to prime the whole lot, and if going 2K then it's around $50 a litre for primer, plus $30-$50 for hardener just for that, would need about 3 litres for light coat, or to fix minor imperfections need about 3-5 litres!!! plus rubbing all that back then spray!!!
i did mine recently, did all the work myself then got it sprayed!! cost me about $1800!! took 3 months to prep but!!
details and more info here
Respray Thread
and click link in sig for results!!
could save you about $3K all up!!