Wetsanded for First Time - Need Expert Review - Huge Photos

[Landerholm]

I have had this scratch on the door of my M3 and finally got up the courage to wetsand it. I applied touchup paint with a toothpick and let it dry for 48 hours. (Actually I tried Langka 3 times before that but the blob eliminator turned my blob into a divot). I used 3M 2,000 grit "wetsanding" sand paper exclusively around an eraser. I let it soak for 3 hours in water/carwash solution prior.

I rewetted the panel after each pass with the sandpaper with my carwash/water spray bottle (was this necessary? It made it glide much more smoothly). I spend maybe 65% of the sanding time getting rid of the blob, and ~35% of the time making sure it was 100% smooth. (Did I go through the clear doing this!?)


Now im not sure if I took off too much clear or not enough! And my door is all hazey and my poor car is ruined!!! Im feeling very emotional right now!!!

I read the tutorial by the member who wetsanded his black G35 sedan. He said not to freak out but Im freaking out!!!

The reason I think I took too much off or not enough is because of the light spots, shown in one of the photos (near bottom). This cant be good!!! (The first few photos are of before I touched the scratch).

Photos:
http://home.comcast.net/~carpedieme/Scratch/Scratch.htm

Oh BTW Im a new member and its nice to meet everyone

[sumptimwong]

I believe you need to use to rubbing compound after sanding, and then follow up with a polish.

[Landerholm]

Thank you for the reply. I am planning on going over it with my PC and a cutting pad starting with 3M Perfect-It II. Does it look like Ive gone thru the clearcoat in those patches, or that I need to sand more? The scratch is completely smooth to the fingernail (You can see numerous faint marks from me feeling it).

I also have clearcoat touchup. Should I apply this over the scratch and re-sand?

[paul79uf]

get it painted by a body shop

i'm sorry, I know how you feel

[Landerholm]

Thats not an option, I want to keep the factory paint.

[acn684]

i think its too late for a clear coat maybe? i fyou do, you'd have to sand again.. But yes you have to go over with a rubbing compound to get the haze out.

[bmwbear]

Originally Posted by Landerholm

Thank you for the reply. I am planning on going over it with my PC and a cutting pad starting with 3M Perfect-It II. Does it look like Ive gone thru the clearcoat in those patches, or that I need to sand more? The scratch is completely smooth to the fingernail (You can see numerous faint marks from me feeling it).

I also have clearcoat touchup. Should I apply this over the scratch and re-sand?

I would also apply the clear coat as well Landerholm (I used and airbrush). I had the same issue with my M3 (was keyed in two places). I had a posting on the forums with before and after pics along with my steps. As for the hazing, it can be removed with polishing even if you don't clear coat it. I was able to get all the hazing out with the Sonus 1/2 products. I'll try to find my thread and post it.


Here is the link.. http://autopia.org/forum/showthread.php?t=69195

[Landerholm]

Thanks for the replies. People like keying these M3s! I guess I can go ahead and put some clear on top, but Im worried that by the time Ive sanded down the blob from the clear, Ill have sanded thru the surrounding factory clear?

How do I know if I can afford to go over it again with sandpaper?

[bmwbear]

Originally Posted by Landerholm

Thanks for the replies. People like keying these M3s! I guess I can go ahead and put some clear on top, but Im worried that by the time Ive sanded down the blob from the clear, Ill have sanded thru the surrounding factory clear?

How do I know if I can afford to go over it again with sandpaper?

Landerholm

I used an airbrush to apply the clear coat. The clear will need to be thinned with the correct paint thinner; I took my bottle of clear to an auto paint supplier and they where able to give me the correct thinner. I masked the area around the “hazy” spot with painters tape and also covered the car with an old sheet to protect from over spray. Make sure you spray over the scratch well and feather out the clear as you get further away from the scratch. I allowed the clear to cure for 2 hours then wet sanded with 2000 grit, followed with Sonus SFX-1, and SFX-2. Go very slowly over the repair with the polishes and the wet sanding marks will come right out.

[jdoria]

It looks like you went through on the right side end if the scratch.

Paint is not an option, then leave it touched up. Once you take a compund to that the thinner areas will get even thinner and you will see more primer and maybe metal.

Depending on the year of the car (2004-2006) and location of the scratch (will an adjacent panel need to be painted to make the blend look good) you will de-value the car $500 per panel painted. Then include the cost to paint at $300 per panel, and you have sometihng to think about.

But if you think this is a car that needs to keep its original paint for resale, think of this - the guy buying it will see the scratch and know he has to repiaint it and take that into consideration when he offers you a price.

Take it to a pro. Let them compund it and touch it up.


Please Note: The de-value price is $500 per panel on a car like an M3, 997, SL500, etc. Lower priced cars do not take this big of a price hit. Most vehicles are hit $100-200 for repainted panels.

[paul79uf]

Originally Posted by jsatek

Depending on the year of the car (2004-2006) and location of the scratch (will an adjacent panel need to be painted to make the blend look good) you will de-value the car $500 per panel painted. Then include the cost to paint at $300 per panel, and you have sometihng to think about.

But if you think this is a car that needs to keep its original paint for resale, think of this - the guy buying it will see the scratch and know he has to repiaint it and take that into consideration when he offers you a price.

Take it to a pro. Let them compund it and touch it up.


Please Note: The de-value price is $500 per panel on a car like an M3, 997, SL500, etc. Lower priced cars do not take this big of a price hit. Most vehicles are hit $100-200 for repainted panels.

I don't understand how getting a panel painted could devalue a car.

Do you not have professional body shops in your area?

My family has been using the same shop for years. They use the highest quality paints, and blend the repair across a large area and you would never be able to tell that it was not the factory paint.

I'd rather buy a used M3 with what appeared to be perfect paint top and bottom than scratched factory paint.

[Landerholm]

Thanks for the replies. I am proceeding to get rid of the haze from the 2000 grit sandpaper. I will be using my PC and a yellow cutting pad.... Will 3M Perfect-It II be able to get rid of the haze? What speed should I be working at?

Thanks!