Key to a good finish - Jemsite
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post #1 of 10 (permalink) Old 07-18-2015, 04:41 PM Thread Starter
 
Join Date: Jun 2014
Location: Sweden
Posts: 234
Key to a good finish

Hi, building a tribute Jem in Nitro finish (Sonic Blue), but after the finishing process, I still have a lot of micro scratches left, and would like some advice for getting rid of them.

What I've done after the last coat of clear, is the following

* Wet sanded with 800, 1200 and 2000 grit and everything is in level
* Cut by hand using circular foam pads and "Meguiar's Ultimate Compound"
* Polished by hand using a new foam pad and Meguiar's Ultimate Polish

The latter is supposed to "Eliminate fine swirl marks".


I'm grateful for any suggestion
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post #2 of 10 (permalink) Old 07-18-2015, 06:25 PM
 
Join Date: Jul 2013
Location: Porto, Portugal
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Re: Key to a good finish

Maybe "Guitar Scratch Remover" if you wet sanded and polished accurately because itīs supposed to be used in the long run of guitar playing. Iīm not an expert neither luthier better wait for other suggestions.
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post #3 of 10 (permalink) Old 07-18-2015, 06:35 PM
 
Join Date: Jul 2013
Location: Porto, Portugal
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Re: Key to a good finish

Iīm sorry, i've read your post again, i was trying to help you solve your actual finnish problem. "KEY" to a good finnish is luthierīs talk, i donīt know
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post #4 of 10 (permalink) Old 07-18-2015, 06:51 PM Thread Starter
 
Join Date: Jun 2014
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Re: Key to a good finish

Quote:
Originally Posted by Tuga666 View Post
Iīm sorry, i've read your post again, i was trying to help you solve your actual finnish problem. "KEY" to a good finnish is luthierīs talk, i donīt know
No need to be sorry, if it's a step involving a product, I'm more than grateful if you know one.
Though, at the moment my suspicion is that I'm gonna have to redo the compound and polish with power tools...
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post #5 of 10 (permalink) Old 07-18-2015, 07:01 PM
 
Join Date: Nov 2012
Location: Massachusetts
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Re: Key to a good finish

I've had the same problem in the past. I think you're not getting all the scratch marks out and moving to the next grit too quickly. For example, if you sand with 800 and then don't do enough with 1200, the 2000 won't be able to get the remaining 800 scratch marks out. I would suggest spending more time with each grit and sand in one direction only. i would also try using a 1500 grit between the 1200 and 2000. Good luck
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post #6 of 10 (permalink) Old 07-18-2015, 07:07 PM Thread Starter
 
Join Date: Jun 2014
Location: Sweden
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Re: Key to a good finish

Quote:
Originally Posted by pwsusi View Post
I've had the same problem in the past. I think you're not getting all the scratch marks out and moving to the next grit too quickly. For example, if you sand with 800 and then don't do enough with 1200, the 2000 won't be able to get the remaining 800 scratch marks out. I would suggest spending more time with each grit and sand in one direction only. i would also try using a 1500 grit between the 1200 and 2000. Good luck
Hm, I may have been a bit eager, yes...Gonna try this, thank you very much
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post #7 of 10 (permalink) Old 07-18-2015, 07:39 PM
 
Join Date: Jul 2013
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Re: Key to a good finish

Still, i think youīre right. Buffing/polishing machines.
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post #8 of 10 (permalink) Old 07-18-2015, 07:57 PM
 
Join Date: Mar 2014
Location: Louisiana, USA
Posts: 238
Re: Key to a good finish

As far as the basic process you've done I see no flaws; wet sand then polish. One suggestion I'd give for you to consider is to wet sand up to 3000 - 3500 grit micro mesh before you start polishing.

I'm not familiar with the polishing compounds you have used but in general there are 2 posibalities that come to mind related to the polishing part that could leave fine scratch marks.
1. The first compound you use after wet sanding is too fine where it doesn't fully remove the scratch marks from the 2000 grit wet sanding.
2. The final polishing compound you used is not fine enough and that is leaving the micro scratches in the finish.

Another thought is that it is possible somewhere along the wetsanding process you didn't fully remove the scratch marks from the previous grit used; ie. You didn't sand enough with the 1200 grit so marks from the 800 grit still remained and never got rubbed out throught the rest of the process.
On a similar note when wetsanding the sandpaper can get clogged easily. If you don't keep it clean enough or get a new sheet the particles caught in the sandpaper can cut into the finish and not get buffed out.

The key to doing a perfect finish it to have patience and take your time. Like I said I don't see anything wrong with your basic process for finishing. Tips, Take your time, keep the sand paper clean & switch it out often. As far as when to swap from one grit to another, for me it's hard to explain, you just have to have done it enough and go by feel. Maybe wet sand to a higher grit before polishing and/or try a different polishing compound (I've used the colortone ones from stewmac with wonderful results).

I hope this helps some and good luck!
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post #9 of 10 (permalink) Old 07-18-2015, 08:18 PM
 
Join Date: Feb 2005
Location: El Paso, TX
Posts: 2,647
Re: Key to a good finish

Quote:
Originally Posted by Pirataz View Post
Hi, building a tribute Jem in Nitro finish (Sonic Blue), but after the finishing process, I still have a lot of micro scratches left, and would like some advice for getting rid of them.

What I've done after the last coat of clear, is the following

* Wet sanded with 800, 1200 and 2000 grit and everything is in level
* Cut by hand using circular foam pads and "Meguiar's Ultimate Compound"
* Polished by hand using a new foam pad and Meguiar's Ultimate Polish

The latter is supposed to "Eliminate fine swirl marks".


I'm grateful for any suggestion
I have used the same technique to refinish dents and dings on guitars. I take the sanding up 5000 before using the compound. Meguires makes some awesome stuff.
j.arledge is offline  
post #10 of 10 (permalink) Old 08-10-2015, 07:48 AM
 
Join Date: Sep 2001
Location: Florida
Posts: 1,147
Re: Key to a good finish

I used to go by hand and had the same problem as you. You really have to use a tool so you can build up a little heat as well.
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