how do i paint my wheel wells/ firewall/ frame?

[myzterray]

so i just pulled myt stroker out and sold it. picked up a 2005 lm7 im working on dropping in. after i removed the engine i decided to remove the core support both fenders, hood and wheel wells. ipicked up a grinder with the sanding attachment but then realized theres a millions different kinds of sanpaper. i got wire brush so im going to get some purple power and go to work on the frame. after i get it down to metel then what? what grit to i sue before primer, after primer, wet sand? i need help..heres now my truck looks right now

[CHEVROLADE]

that por15 works good....

[myzterray]

that por15 works good....

i will look for some. but my main concern is the actual prep and paint of the wheel wells and firewall..ill probably do the core support as well.

[Botlfed]

You dont need to go down to the metal, but if any metal shows up you have to prime that area, anyways sand the stock paint with wet 600, then sand wet with 1500 grit, paint and clear, if you do go to the metal prime with 2-3 coats primer, sand primer with same method as already stated, believe me your doing a small project compared to the crap i just went thru

[myzterray]

You dont need to go down to the metal, but if any metal shows up you have to prime that area, anyways sand the stock paint with wet 600, then sand wet with 1500 grit, paint and clear, if you do go to the metal prime with 2-3 coats primer, sand primer with same method as already stated, believe me your doing a small project compared to the crap i just went thru

cool thanks alot!!! thats the info im looking for..do i have to wet sand after i paint? now i have decided whether i wabnt to do flat black or gloss black. im thinking flat black on the inner wheel well then all gloss in the engine bay.

[Botlfed]

you can wet sand after you paint if you want, but under the engine bay i wouldnt even worry about it, but if you do you gotta use a very fine paper like 3000 grit, its called color sanding and its used to get out any orange peel or blemishes, but usually thats done on the outside of the vehicle, i didnt do it all anywhere. Basically any sanding you do unless on bondo needs to be wet, and you cant really get it to wet, remember copius amouts of water.