White Spots on Spruce Top

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White Spots on Spruce Top

Postby Claude Marino » Fri Nov 29, 2019 4:07 pm

Hi, I'm rebuilding a 12 string. 1970's Westminster Made in Japan. Sanded the top, it's Laminate. Then I got these white spots. Any idea what they are or how to fix? Thanks! (New member and first post).
Attachments
Top of Body.JPEG
Below Soundhole.JPEG
Above Soundhole.JPEG
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Re: White Spots on Spruce Top

Postby Bob Orr » Fri Nov 29, 2019 5:08 pm

The two darker spots look like you sanded through the top layer of spruce in the laminate. Also looks like the top has been coloured with stain or more likely tinted lacquer and the white areas are where you have sanded through the stain/lacquer to the bare wood. They could be touched up by re staining to match but that is not easy. Don't know any way to repair the sand through to the darker layer other that a top replacement.
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Re: White Spots on Spruce Top

Postby Bob Orr » Fri Nov 29, 2019 5:09 pm

Another thought, why did you sand the top in the first place?
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Re: White Spots on Spruce Top

Postby Claude Marino » Fri Nov 29, 2019 6:26 pm

Hi Bob, Thanks for your reply. This is mostly parts. Not in very good shape either. I'm rebuilding these parts into a travel guitar. The neck is still attached to the top and is in very good shape. There were some very deep dings in the lacquer, scratches and even a gouge so I wet sanded with 800, 1200 and 1500 grit. Not sure I can match the stain but I can give it a shot and see. Much appreciate your answer, thanks.
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Re: White Spots on Spruce Top

Postby Barry Daniels » Fri Nov 29, 2019 9:43 pm

Stain is not going to help.
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Re: White Spots on Spruce Top

Postby David King » Fri Nov 29, 2019 11:56 pm

I'd hit them with some thin CA and see what you get. It won't get any worse. Cheap CA tends to yellow which you don't want so try an upper shelf variety like BSI, loctite, Satellite City.
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Re: White Spots on Spruce Top

Postby Claude Marino » Sat Nov 30, 2019 9:51 am

Barry Daniels wrote:Stain is not going to help.


Hi Barry,
What would help? Is there a way to color those spots so the guitar will look nice?
Thanks!
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Re: White Spots on Spruce Top

Postby Claude Marino » Sat Nov 30, 2019 9:51 am

David King wrote:I'd hit them with some thin CA and see what you get. It won't get any worse. Cheap CA tends to yellow which you don't want so try an upper shelf variety like BSI, loctite, Satellite City.

Thanks David, going to see what happens on a small piece of top.
Thanks!
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Re: White Spots on Spruce Top

Postby Peter Wilcox » Sat Nov 30, 2019 10:50 am

You might want to dry sand those areas, as it looks like the wet sanding has raised the grain. There might not be any stain on the finish - just the lacquer (or whatever is on there), which also might have aged. If you have any naphtha (or Ronsonol lighter fluid which is naphtha) you could wipe some on (it will evaporate off) to see how well new finish will match before you apply something permanent.

I don't think there's anything you can do to hide where you sanded through the laminate - just fill with epoxy if they are pits, and call them age spots. :)
Maybe I can't fix it, but I can fix it so no one can fix it
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Re: White Spots on Spruce Top

Postby Claude Marino » Sun Dec 01, 2019 8:55 am

Hi Peter,
I took your advice, dry sanded and cleaned with Naphtha. Am going to take it to the store and see if I can sorta match the color of stain. I like your idea about the "age" spots. Heck, this guitar is almost as old as some of my socks.
Thanks so much!
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Re: White Spots on Spruce Top

Postby Barry Daniels » Sun Dec 01, 2019 11:52 am

Again, you should not put stain on this. The color of the top is from natural aging of a CLEAR finish. You cannot achieve this with stain. What you need is a toner, which is typically not even available in paint stores. The closest you can get with an off the shelf item is shellac. Adding a drop or two of dye to the shellac would get you close, but the dye is also not a typical off the shelf item except at specialty wood working stores.
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Re: White Spots on Spruce Top

Postby David King » Mon Dec 02, 2019 2:52 am

Mohawk makes nice magic markers that come in a large array of wood tones. You do have to experiment with them on a wood sample to get the right color but once you know the color you could buy just the one you need.
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Re: White Spots on Spruce Top

Postby Bob Gramann » Mon Dec 02, 2019 9:46 am

If you start with shellac on the wood before you refinish it, over the years the light spots will blend with the older, untouched surface. If you dye it, over the years the colors will move apart as the dye ages differently than the natural wood.
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Re: White Spots on Spruce Top

Postby Clay Schaeffer » Mon Dec 02, 2019 9:49 am

To me it looks like the top has "suntanned" (UV) and you have sanded through that. You could try some potassium permanganate (oxidizer) to color it some. Start with a wash of a dilute solution and repeat to bring the color in gradually. Another thing that could work is a Powder stain rubbed on the surface and set with a mist of finish. Mohawk makes them in a number of hues that can be blended to fine tune the color.
As David mentioned, Mohawk makes magic markers also, as do others which are available at your local hardware store. It may be difficult to find a perfect match but you might get close.
Often with a beat up finish the best course of action is to just clean it up and accept the war wounds. Sometimes you can retouch areas to make things less conspicuous, but it is hard to make things go away completely.
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Re: White Spots on Spruce Top

Postby Carl Dickinson » Mon Dec 02, 2019 9:49 pm

Or tape it off and spray it black. I had to do that once. :oops:
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Re: White Spots on Spruce Top

Postby Eric Baack » Tue Dec 03, 2019 6:48 pm

Carl Dickinson wrote:Or tape it off and spray it black. I had to do that once. :oops:



Yeah, the Rolling Stones philosophy might be best here....
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