A question on painting & prepping please..

[bigsyko75]

Hi everyone right got miself a little problem i hope someone can help me out with,i own a 2003 Ford ka,when i bought it it had blistering paint and a little rust around the fuel filler flap so i got the dremel out and ground it all away,rubbed down with sandpaper,cleaned,treated with kurust,my problem is now i've rubbed down the area with 1200 wet n dry so the area is now smooth ready to be primed i'm thinking that when i apply the primer to the surface the primer won't stick cos the surface is too smooth,does anyone know what grade of sandpaper i need to use on the area before i apply the primer,i want it to stick so it covers the areas i've rubbed down,any help much appreciated.

[Benn]

180 grit before primer. Flat primer off with 320 then 800(wet).

[bigsyko75]

cheers for the reply fella the primer is now on and it stayed on so thats good,just waiting for it to dry now,just wanna know though can you spray a colour on top of laquer or does the laquer need to come off first?,i'm thinking the area i've repaired and gonna spray might look a shade different to the original,i'm spraying from a tin and its moondust silver,i thought about doing the whole panel rather than having it 2 shades of moondust silver but would i need to take the laquer off first?,if so then what do you recommend is the right size sandpaper for that?