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19typethree67
Samba Member
Joined: April 18, 2007
Posts: 351
Location: Grand Rapids, MI
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 Posted: Thu Sep 23, 2010 3:19 pm Post subject: Sand down orange peel? |
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So I made one of many beginner mistakes in that I only put three coats on my car last fall and so wasn't able to color sand all the orange peel out before I got to the primer. BTW I used single stage PPG concept - Black!
I plan on painting it again next spring but I'm wondering how to go about it properly. Should I sand it completely down to primer? If I just rough it up for paint instead, would the orange peel show through again with successive layers of paint? What do you guys recommend?
Gracias |
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deaner
Samba Member
Joined: September 06, 2009
Posts: 72
Location: mt
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| Posted: Thu Sep 23, 2010 3:24 pm Post subject: |
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you dont need to sand it to primer as long as the previous layers were prepped properly. you will be able to see the orange peel very well in black paint once you start sanding. sand until there is no more dimples. (once again this will be very obvious) if you want it really flat, sand it out by hand with blocks, using long strokes. takes longer but your finish will be flatter. then clean alot...and re-shoot your single stage!
do this when your ready to paint. dont sand it out then shoot six months from now.
hope that helps
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deaner
Samba Member
Joined: September 06, 2009
Posts: 72
Location: mt
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| Posted: Thu Sep 23, 2010 3:26 pm Post subject: |
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oh yeah, sand it out to 400 grit. dont watch scratches in the new stuff! 
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19typethree67
Samba Member
Joined: April 18, 2007
Posts: 351
Location: Grand Rapids, MI
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| Posted: Thu Sep 23, 2010 5:28 pm Post subject: |
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| deaner wrote: |
you dont need to sand it to primer as long as the previous layers were prepped properly. you will be able to see the orange peel very well in black paint once you start sanding. sand until there is no more dimples. (once again this will be very obvious) if you want it really flat, sand it out by hand with blocks, using long strokes. takes longer but your finish will be flatter. then clean alot...and re-shoot your single stage!
do this when your ready to paint. dont sand it out then shoot six months from now.
hope that helps |
Thanks very much for the tips. But to be clear I have already wet sanded with 1500 grit as much as I really can before I start to see small areas where I am going through to the primer.
Should I keep going and get all the orange peel out (it's about 1/2 gone) even though some areas will break through? Or are you saying to just paint over what I have and then worry about any orange peel later on the new coats? |
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19typethree67
Samba Member
Joined: April 18, 2007
Posts: 351
Location: Grand Rapids, MI
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| Posted: Thu Sep 23, 2010 5:32 pm Post subject: |
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| 19typethree67 wrote: |
| deaner wrote: |
you dont need to sand it to primer as long as the previous layers were prepped properly. you will be able to see the orange peel very well in black paint once you start sanding. sand until there is no more dimples. (once again this will be very obvious) if you want it really flat, sand it out by hand with blocks, using long strokes. takes longer but your finish will be flatter. then clean alot...and re-shoot your single stage!
do this when your ready to paint. dont sand it out then shoot six months from now.
hope that helps |
Thanks very much for the tips. But to be clear I have already wet sanded with 1500 grit as much as I really can before I start to see small areas where I am going through to the primer.
Should I keep going and get all the orange peel out (it's about 1/2 gone) even though some areas will break through? Or are you saying to just paint over what I have and then worry about any orange peel later on the new coats? |
Ya know what, I re-read your post and I think I get the jist now. For some reason it didn't make sense at first. Basically take out the orange peel, even though some areas will be down to primer...but only right before painting.  Should I even use 800 just to make sure about the scratches? |
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deaner
Samba Member
Joined: September 06, 2009
Posts: 72
Location: mt
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| Posted: Fri Sep 24, 2010 10:49 am Post subject: |
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no the 400 should be fine. single stage covers well. a finer grit can make less adhesion. so you have it right. when you get close to reshoot time, just re sand it, dont sweat it if you go through to primer and then shoot.
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kburg12
Samba Member
Joined: June 06, 2010
Posts: 393
Location: South Carolina
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| Posted: Sat Sep 25, 2010 3:44 am Post subject: |
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Just to add to what Deaner is saying to help make it even clearer for you. When a body man finishes his initial body work and after he primes and before he paints a car, the last grit he might use is 320, 400 to smooth out his work and remove the deeper scratches. So if you use the 400 to get through your orange peel then you are in a sense just prepping you body and older paint for a new paint job. The higher grits are for color sanding your clearcoat before polishing. The 320 or 400 grit should leave scratch marks too fine to be seen through the actual paint job. If after your sanding is done, you have bare metal or if you have alot of spots where the primer or older paint shows through, I would spray a coat or 2 of primer and then sealer so that your final paint jobs shade looks even when finished. Hope this helps you understand a bit better.
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artie325
Samba Member
Joined: July 25, 2005
Posts: 187
Location: Hamburg, NY
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| Posted: Sun Sep 26, 2010 7:44 am Post subject: |
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I ran into the same problem when I painted my car. I did not have enough CFM to get a good spray pattern which resulted in orange peel. I recently sanded the whole car down with 400 grit and plan on reshooting the car in the next couple weeks. Check out my post on my painting issues. My guess is that you went through the same thing.
http://www.thesamba.com/vw/forum/viewtopic.php?p=4156100&highlight=#4156100 |
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19typethree67
Samba Member
Joined: April 18, 2007
Posts: 351
Location: Grand Rapids, MI
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| Posted: Sun Sep 26, 2010 12:45 pm Post subject: |
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| artie325 wrote: |
I ran into the same problem when I painted my car. I did not have enough CFM to get a good spray pattern which resulted in orange peel. I recently sanded the whole car down with 400 grit and plan on reshooting the car in the next couple weeks. Check out my post on my painting issues. My guess is that you went through the same thing.
http://www.thesamba.com/vw/forum/viewtopic.php?p=4156100&highlight=#4156100 |
It looks to be exactly my problem, same paint and everything. 
Never thought that I didn't have enough CFM for the spraying but I should look into it more. It was my first time shooting and even though I tried, I'm sure the gun wasn't set up exactly right either.
Let me know how your new re-spray comes out. I plan on doing mine probably next spring now. |
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artie325
Samba Member
Joined: July 25, 2005
Posts: 187
Location: Hamburg, NY
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| Posted: Sun Sep 26, 2010 2:57 pm Post subject: |
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| Will do. I was using a Devilbiss Finish Line gun with a Craftsman 30 gallon compressor. I upgraded to a 60 gallon compressor, which would do the job. I will post pics after I paint. |
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