So i received my paint from tower incl some red oxide primer.
When removing the wing, I tried to coax it free of the double sided tape and was met with disaster.
Now, I am faced with repairing it as well.
So far so good.

Here is the thread from M3 forum:

http://bimmerforums.com/forum/showthread.php?t=550088

I used 150 grit to knock down the high spots from the adhesive and followed with 600 mainly bc that's all I had available that was somewhat coarse.
600 grit I used for the rest of the surface.
I'm a little skittish about painting this thing, but it was really in need with the clear flaking in one small spot and the color faded.
I have 1200 or 1500 (can't remember which at the moment) and 2000.
Is it necessary to use the 2000 or better to use a mildly abrasive polish like Turtle Wax scratch remover which I want to use up?

Should I sand after priming once or wait until the 2nd primer coat?
Any need to sand in between paint coats?
Sand after all paint coats finished?

Nobody has any clue about painting and preparation?

Alright I'll help out

Use your 150 grit to sand it down all theway til it's through primer (or you can stop at the primer if you've gotten all the paint off).
Then use 600 grit and sand again.
You can now put one light even coat of primer on.
Sand with 600 grit again.
Another coat of primer.
600 again.
Put on a coat of your paint (hellrot?).
600 again.
1200 grit.
Another coat of paint.
600
1200
Another coat
600
1200
Another coat of paint.
600
1200
Another coat
600
1200
Put on some clear coat
600
1200
Put on some clear coat
600
1200
Put on some clear coat
600
1200
Put on some clear coat
600
1200
Put on some clear coat
600
1200

That should make it pretty good.

I was always told not to sand the final color coat before clear.

B

thnx, I won't go that far, but I do have all the materials mentioned.

Why sand the final clearcoat?
Will polish bring the lustre out?

well wet sanding the clear is good because you will most likely have orange peel and other imperfections in it. wet sanding the clear will remove those. This will also make it dull so it must be polished to bring back the shine.

I put the first coat of Hellrot on tonight after 3 coats of primer.
Waited until the day after between each coat to be sure I sanded a hard surface.

The other end:

I decided to sand before quitting for the night.
Next pic will be the final step.

Tower told me that I should wait 3 days after painting to apply the clear coat.
So, I have a question: sanding produces a streaked appearance;
I'm wondering if the application of clear will permit the streaks to show through?
If so, how do I prevent this?

dont sand the color coat, its not neccesary. as long as you sanded your primer well and put down a good color coat then the paint wont have any defects. After i put down the base coat i usually wait about 15 mins then i apply the clear. Im assuming this is spray can paint, so when you put on the clear your going to have to put it on really thick so their is not a textured look to it.

So I can just put the last color coat on and clear over it without any more sanding?
I have: 3 primer coats and 6 paint coats so far.

Problem is getting an even coat on it. Spray cans sputter or if I take a msec too long in one area, it will form a ridge/run that needs sanding.

So now I have 8 coats of paint bc the sanded layer was streaking and looked like putting clear over it would allow them to show through.
Tested under the wing on the ends. One side sanded the other not then cleared both.
The sanded side showed a little change; the non-sanded is solid.
So I sprayed the last (I hope) paint layer last night.
I'm kinda burnt on this project now, so this is the point where I finish up.
Will post a pic of final product.

Before I do sand the clearcoat, I have been doing all without a sanding block.
Should I use one?

I was always told not to sand the final color coat before clear.

B


Quite right. I went to my friend's shop today and talked with the head painter while looking at the wing.
He said NEVER sand the final paint coat.
So now I have to use whats left of the 2nd can to do the final coat before clearing.
Glad I sanded only the top side as I have only the one side to paint now with little to go around.

man looks like your on your way. any questions pm me.

Looking forward to seeing the finished product. I'm planning on doing this as well.

why does only the wing need to be repainted?

and where do you get bmw colors in a spray can??!??

why does only the wing need to be repainted?

and where do you get bmw colors in a spray can??!??
Not sure why, but it faded badly and there was a small spot where the clearcoat started to break up.
I decided I could no longer abide the shitty looking wing on my shiny car.
The clearcoat flaking was the last straw.

Cans from Paintscratch.com; TowerPaint.com; automotivetouchup.com (maybe need to add 'paint' to URL on the last one)

I really suck at this.
More fucking waves than Malibu.
Sand, wash, dry, spray, damned wind, run, wave.
I guess the trick to using a can is to get that thing moving before the paint or clearcoat sprays.
This could turn out to be a disaster.
Oh well, I tried.
Will 2000 get the shine on the clear? Some of those runs are wide, but fortunately on the underside.

This doesn't look right:

That is what happened when I sanded the runs in the clearcoat.
Fortunately, the top side is in good shape with no runs and no sanding.
It's as if the clear hadn't fully dried and the wetsanding embedded the detritus into the surface bc I can't get it off with a wet cloth.
The Krylon clear is supposed to dry within 12 minutes and I waited well over an hour.
The digicam exaggerated the features and I played with the editor to bring it out.
Doesn't look that bad, but I would like to fix it.

my experience with painting models is, do it indoors.
clear out your garage and spray very far away, and yes, get the can moving fast before spraying. thin coats man, THIN.
the first should be so thin it looks like its pink (with a white undercoat.)
i think your just not spraying far enough away.


---but also, spray will never get you that shine like a normal paint job, its great for plastic models but....
take the wing to a pro, it cant be that much to get it done...

Done.
Will post a pic later tonight.

That came out looking pretty nice for a spray can paint job.

That came out very good. It matches the paint perfect. What did you buff it with after wetsanding?