Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Sun Nov 24, 2024 5:14 pm


All times are UTC - 5 hours


Forum rules


Be Nice to our new friends! Remember, everybody starts somewhere!




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Wed Nov 15, 2017 3:51 pm 
Offline
Koa
Koa

Joined: Fri Feb 10, 2017 11:09 pm
Posts: 870
Location: Cowichan Valley, BC, Canada
First name: Conor
Last Name: Searl
City: Duncan
State: British Columbia
Zip/Postal Code: V9L 2E5
Country: Canada
Status: Semi-pro
I've started wet sanding this guitar. I used Brite-Tone instrument lacquer and all has been going well. But as I've started wet sanding I've noticed this weird texture for lack of a better word in the finish. Does this look like it will buff out in the end?


You do not have the required permissions to view the files attached to this post.


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 4:00 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Thu Nov 04, 2010 1:46 pm
Posts: 2150
First name: Freeman
Last Name: Keller
Focus: Build
Status: Amateur
Did you clear coat or are you trying to buff your color? What grit are you at right now?

I guess the answer is, I don't know but since you have started color sanding go ahead and see what happens. DO NOT use wax or silicon polishing compounds and if it doesn't come out you can always shoot more lacquer (the beauty of lacquer) including clear. Another choice might be to shoot a couple of coats of lacquer thinner to try to get it to blend together or possibly a coat of blush remover

http://www.stewmac.com/SiteSearch/?sear ... h%20eraser


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 4:13 pm 
Offline
Koa
Koa

Joined: Fri Feb 10, 2017 11:09 pm
Posts: 870
Location: Cowichan Valley, BC, Canada
First name: Conor
Last Name: Searl
City: Duncan
State: British Columbia
Zip/Postal Code: V9L 2E5
Country: Canada
Status: Semi-pro
Freeman wrote:
Did you clear coat or are you trying to buff your color? What grit are you at right now?


I did the clear coat, and that's after wet sanding to 800 grit.

Is this what it looks like when the different coats don't melt together?

Conor


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 4:38 pm 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Sun Mar 06, 2011 12:04 am
Posts: 5821
First name: Chris
Last Name: Pile
City: Wichita
State: Kansas
Country: Good old US of A
Focus: Repair
Status: Professional
Quote:
Is this what it looks like when the different coats don't melt together?


Yuppers. You have sanded through the thin top coat into the color coat. That's EXACTLY what it looks like. So.... Add more clear.

_________________
"Act your age, not your shoe size" - Prince


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 6:35 pm 
Offline
Koa
Koa

Joined: Fri Feb 10, 2017 11:09 pm
Posts: 870
Location: Cowichan Valley, BC, Canada
First name: Conor
Last Name: Searl
City: Duncan
State: British Columbia
Zip/Postal Code: V9L 2E5
Country: Canada
Status: Semi-pro
Chris Pile wrote:
Quote:
Is this what it looks like when the different coats don't melt together?


Yuppers. You have sanded through the thin top coat into the color coat. That's EXACTLY what it looks like. So.... Add more clear.


Gaarrrggh

I always end up doing that. Everyone talks about how important a thin coat is and so I've tried to keep it thin, but nuts!

I'm going to go err on the side of too many until I figure this out. Thanks Chris.


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 6:55 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Thu Nov 04, 2010 1:46 pm
Posts: 2150
First name: Freeman
Last Name: Keller
Focus: Build
Status: Amateur
Conor_Searl wrote:
Chris Pile wrote:
Quote:
Is this what it looks like when the different coats don't melt together?


Yuppers. You have sanded through the thin top coat into the color coat. That's EXACTLY what it looks like. So.... Add more clear.


Gaarrrggh

I always end up doing that. Everyone talks about how important a thin coat is and so I've tried to keep it thin, but nuts!

I'm going to go err on the side of too many until I figure this out. Thanks Chris.


Thin is (relatively) important on an acoustic, but kind of hard for a newbee to do. Thin doesn't matter a bit on an electric - look at many of the imports and they look like they are dipped in plastic.

If I'm doing color with lacquer I shoot maybe five or so coats of the color - most of the time I'm trying to still have the grain show thru so the coats are pretty thin and there isn't a lot of dye mixed into the lacquer (four or five drops in four oz of lacquer). I will level sand that and then shoot 10 or 15 or more coats of clear - usually thinned 1:1 depending on the temp and humidity. When I sand and buff I want it to be entirely the clear that gets buffed.

I don't do solid colors like yours, but I have a very good friend who paints custom motor cycles and he frequently does guitars. He only uses two part automotive finishes and is meticulous about getting the color coats perfect, then doing the clear over that. Because they are catalyzed they are thicker coats and less of them. Again, all the buffing gets done on the clear.

However, if that is lacquer then just add more clear coats, let cure and continue on


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 10:56 pm 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Fri May 18, 2012 8:35 pm
Posts: 2660
Location: Austin, Texas
First name: Dan
Last Name: Smith
City: Round Rock
State: TX
Zip/Postal Code: 78681
Country: USA
Focus: Build
Status: Amateur
I believe brite-tone is water-based.
Wonder if this could be witness lines between two layers?
Might be worth asking the manufacturer to confirm.
It does look like you have gone thru the clear coat as others have stated.

_________________
wah
Wah-wah-wah-wah
Wah


Top
 Profile  
 
PostPosted: Thu Nov 16, 2017 12:18 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Thu Nov 04, 2010 1:46 pm
Posts: 2150
First name: Freeman
Last Name: Keller
Focus: Build
Status: Amateur
dzsmith wrote:
I believe brite-tone is water-based.
Wonder if this could be witness lines between two layers?
Might be worth asking the manufacturer to confirm.
It does look like you have gone thru the clear coat as others have stated.


I learned a trick when I was shooting water born lacquer (KTM-9). When I cleaned my gun with water I then put some denatured alcohol in it and shot that into the air to clear out all the water. I left a little DA in the cup and before the next coat of KTM-9 I just shot a mist of DA onto the guitar. That seemed to tack the old finish and get the new lacquer to melt in better. Before doing that I would get witness lines, none afterwards. Don't know if this would work with any other finishes - as they say, practice on scrap.



These users thanked the author Freeman for the post (total 2): dzsmith (Thu Nov 16, 2017 6:06 pm) • Bryan Bear (Thu Nov 16, 2017 2:01 pm)
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
phpBB customization services by 2by2host.com