painting over another color

i'm trying to work on the body of an r34 skyline and i decided to go with the gloss aluminum paint from tamiya, but i don't know if it's such a good idea anymore.

i painted the car, but the job came out not-so-well so i wiped off all the paint with nail polish remover, and then i started painting again, but the paint ran out. so i'm wondering...since i have to go get more paint anyway, why not change the color? i was thinking the mica blue...(bayside blue...whatever it is)

would i have to remove all the paint all over again, or would it cover up alright?

also...what's the importance of primer? I've looked on the forum and i know how to apply it, but i couldn't find a reason for using it.

thanks.

If you have a look in the FAQ's section it will answer most of your questions Look here (http://www.automotiveforums.com/vbulletin/showthread.php?postid=578991#post578991) for explantion about why primer MUST be used.

Cheers

what do you mean by "not so well"?? if you were a little more specific I might be able to help you.

okay, the gray paint job came out not-so-well because i did it at night and i really couldn't see what i was doing TOO well..but you know how it is. the excitement of wanting to finish one kept me going.
anyway. some dust landed on it. i oversprayed on some parts. it wasn't bad, but it wasn't perfect. so i got most of it off with nail polish remover which took me a good hour and a half.
therefore, i was wondering if i could just spray the mica blue over the glossy aluminum.

i'm expecting a resounding 'no' to this question, but i thought i'd ask anyway.

and oh...i haven't been using primer because in the past, my models (all of...two) seem to be fine without it.

thing number one: dusts are no problem. the only way you can lay down a perfect paint job is with luck. so short of luck all you need to do is to sand the paint down to get rid of the dusts. get one of those polishing clothes (millennium 2000, for instance).. they are a must for getting a perfect finish. use the 3200 grit to sand away the dusts.

as for overspraying.. that's a much bigger problem. if you cant sand it down you must strip it. there is no other fix. always spray in thin costs at first and the last two thick costs must be done under well lite contition to avoid overspraying

spraying mica blue over aluminum.. you must determine whether the blue is translucent. if it is you cannot and you must cover the aluminum with a coat of primer. if the blue is solid than you might not have to.. but a coat of primer is always a good idea.

If you have to much paint on already you will need to strip all the paint off as you will start to loose the detail of the kit.
If there isn't much paint.........
Sand the paint back, wash the body off of dust and then prime. The prime will help the top coat "stick" to the body.