HELP with bodywork

Hey guys,

Im in the stages right now of getting my scamp ready for paint and want to get some feedback on what im doing, so please let me know if im doing ok...currently the car has been blocked with 80 grit and has bondo where nescessary (blocked as well)...after i smooth everything out with the 80 grit i was going to block everything with 120.....Then i was going to buy some duplicolour high build primer in spray bombs and paint the whole car, then block with 220, 320, then 400 wet....Does this sound okay? The car has not been stripped to baremetal since the factory paint is in great shape, so wil that affect my process at all? After i primer the car and block it, if i expose high spots again do i use putty or filler? When i use 400 wet to smooth out everything, will the water seep through the bondo and ruin the job? I know this is alot guys, but im really coming down to the wire here and want to make sure im doing everything right.

Thanks in advance for any advice guys
Matthew