Which Sand Paper Grit to use?

Joker_J

So I was driving on the highway and saw a black item just bounce towards me. I knew it was something that would do damage so once I saw it bounce in the air, I sped forward because it was heading for the hood. Luckily I saw it go above my car and I thought, "F-yea, dodged that shieeeet." But a split second later I heard a big, "Thump" like something dropped on my car. After getting to my destiation, got out of the car and saw no dents but a scratch on the roof-top. I put touch up paint on top and now I'm wanting to sandpaper it smooth. Which type of sandpaper grit should I use?

Thank you..

DEpointfive0

2000

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kenchan

let dry for a week, 2000 or even 3000 grit, then polish the rest using something like ScratchX on foam pad.

i use a sanding block, not sand paper for this.

Joker_J

Thank you. I was pissed when I heard the sound hit the roof...
Thankfully it was only a scratch and not a dent lol

kenchan

Step1: done!

Joker_J

ahahaha you and your steps! lol

So sandblock rather than sand paper?
I'm eventually going to vinyl the roof top black. I just want it to be smooth so during the process I don't see a little scratch mark or lump lol

kenchan

well, you can wrap the sand paper over a block of wood or something to get a similar effect of a sanding block. i just happen to have sanding blocks in my pdr arsenal.

yah, definitely smooth it down completely before vinyl. you'd be amazed how much the bump will show through on a non textured glossy vinyl..!

Joker_J

I'll just buy a sandblock haha
too lazy to,,,
1)buy sandpaper grit
2)find a wood block for the sandpaper grit.
3)wrap the sandpaper to where it doesn't slip

brancky3

Sanding blocks for paintless dent repair??

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Joker_J

I think he meant for the smoothing out.
What I did was, I let the touchup paint seep into the scratch, then waited until it dried and added more layers until it formed somewhat of a mini-mountain of a line where the somewhat deep scratch was. Now I just need to sandpaper a smooth it down.

brancky3

Oh I know, but in PDR no paint work is done at all (hence paintless )

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JARblue

PDR isn't always possible, and you don't always know this before you get started. So in cases where you can't just massage the dent out, you will need some form of paint correction, usually minor. Hence, the PDR arsenal does include paint repair tools.

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scottIN

See if you can find some Langka around. A lot easier than trying to sand a tiny little scratch. Although it's supposed to be used right after touch up, it will work a week or two later.

http://www.langka.com/

Duc_Z09

I use 1500, then 2000, then 3000 after clear-coating a car. As others have said you may want to start with 2000 to be safe, but don't be in a hurry and definitely use a sanding block. Also, use warm water when sanding and be careful when you buff it out because (as others have also said) Nissan's factory paint is crap.

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Joker_J

Roger. I was just wanting it smoothed out so the vinyl once installed has no cosmetic damages lol I wish all 370Z's came with the protection clear bra thing haha