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PostPosted: Fri Mar 10, 2017 1:32 am 
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Joined: Tue Sep 29, 2015 11:45 am
Posts: 31
Hi everyone,

I was wondering what grit to use when starting to wet sand. I choose to apply with a brush, which the directions say is possible. I put 3 coats on, then waited 24 hours, and sanded with 400, then applied another 3 coats. I was wondering which grit to start wet sanding after it dries a month? I think I'm happy with the results from the brush. I applied it very lightly and evenly over the body.

Thanks!


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PostPosted: Fri Mar 10, 2017 7:39 am 
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Joined: Fri Mar 03, 2006 7:09 pm
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Location: Hegins, Pa
we all may do things a little different but what I can tell you what I do
600 first to start cutting through the orange peel surface bumbs
when I am about 1/2 way through them I use 800
when I am just about bottomed I go to 1000
then once leveled I do 1500 2000
then buff and polish
after that I use Maquires swirl remover and 3m Hand glaze

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PostPosted: Fri Mar 10, 2017 11:19 am 
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Joined: Sat Apr 10, 2010 10:50 pm
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Location: Seattle
Take care with the final coat sanding. KTM-SV does not burn into the previous coat. If you sand through your final coat you will get witness lines. I found it hard to brush on KTM-SV and sand it without sanding through somewhere. Ultimately I got a spray gun and sprayed the final coat on a completely level surface. That coat took almost no sanding before I polished it out.

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PostPosted: Fri Mar 10, 2017 4:40 pm 
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Joined: Tue Sep 29, 2015 11:45 am
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I was really hoping to avoid using a spray gun. Do you think it would be possible to user 400 very lightly to get the brush marks out before using 600?


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PostPosted: Fri Mar 10, 2017 7:32 pm 
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Joined: Sat Apr 10, 2010 10:50 pm
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Location: Seattle
mike288 wrote:
I was really hoping to avoid using a spray gun. Do you think it would be possible to user 400 very lightly to get the brush marks out before using 600?
I am not sure you have to wait a month with this finish it is not Nitro. I say this because then I could tell you sure try the 400, if you sand through the last coat apply another. If you are waiting a month in between though ... The witness line are visible as you are getting more to the polishing grades of paper.

Here is the writeup that I used when I used it.

http://www.newenglandluthiers.org/contents/Articles/Tips_Techniques_Tools/ktm-sv_an_overlooked_finish.html

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Last edited by johnnparchem on Sat Mar 11, 2017 10:03 am, edited 1 time in total.

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PostPosted: Sat Mar 11, 2017 12:47 am 
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Joined: Tue Sep 29, 2015 11:45 am
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Hey John, thanks for the help. The link you gave me doesn't work. Do you think you could try again, or private message me it?


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PostPosted: Sat Mar 11, 2017 10:02 am 
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Joined: Sat Apr 10, 2010 10:50 pm
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Location: Seattle
mike288 wrote:
Hey John, thanks for the help. The link you gave me doesn't work. Do you think you could try again, or private message me it?


whoops
http://www.newenglandluthiers.org/contents/Articles/Tips_Techniques_Tools/ktm-sv_an_overlooked_finish.html

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PostPosted: Sat Mar 11, 2017 4:13 pm 
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Joined: Tue Sep 29, 2015 11:45 am
Posts: 31
Thanks John! I'm reading the final steps, and it says nothing about water. Am I wet sanding the guitar, or is it without water?


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PostPosted: Sat Mar 11, 2017 4:50 pm 
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Joined: Sat Apr 10, 2010 10:50 pm
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Location: Seattle
i did not use water, but i usally do not with water based finishes.

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