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#1296906 - 10/30/09 10:10 PM Re-Finishing With 80 Grit Sandpaper?
AUTPHF Offline
Full Member

Registered: 10/20/09
Posts: 55
Hi,

I am starting to refinish some of the parts of my piano. I have stripped off the finish with circa 1850. I have a book that is telling me to start sanding with 80 grit sanpaper and work up to 320 grit.

To me, using 80 grit seems awfully coarse for this job? Why start with 80 grit? Is that to remove some of the stain as well?

The veneer is only so thick so wouldn't 80 grit be a quick way of sanding through the veneer?

Any insight here is appreciated.



TB


Edited by AUTPHF (10/30/09 10:10 PM)

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#1296953 - 10/30/09 11:31 PM Re: Re-Finishing With 80 Grit Sandpaper? [Re: AUTPHF]
Thomson Lawrie Offline
Full Member

Registered: 12/12/04
Posts: 283
Loc: Grimsby ON Canada
80 grit is out of the question. If you have used steel wool with the stripper it should be clean enough to stain with a bare minimum of sanding. Use 200 if you sand at all.

A mixture of methyl hydrate and lacquer thinner will clean up the residue of the old finish if you apply it with fine steel wool and rub it down with the steel wool. The wood was fine sanded when the original finish went on. Unless the stripper you used was water based it won't have raised the grain. If you are sanding it to clean up the wood then you have gotten ahead of yourself. If there is any residue of the old finish then you aren't finished stripping it. Clean it up with steel wool first.
_________________________
Piano Technician
www.pianotech.ca
Piano tuners make the world a better place, one string at a time.

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#1296965 - 10/31/09 12:02 AM Re: Re-Finishing With 80 Grit Sandpaper? [Re: Thomson Lawrie]
Gene Nelson Offline
1000 Post Club Member

Registered: 09/10/04
Posts: 1585
Loc: Old Hangtown California
A wash with TSP and a soft brass wire brush will also clean up the stripper residue. It will raise the grain then you can sand if flat with 220.
Mineral spirits also works well and Mohawk has a stripper wash product. I like the TSP because the others vaporize quite fast and you will need an organic vapor mask. Cleaning up the gunk in the grains takes a bit of scrubbing and the TSP will give you more time to work.
Did you need to do any veneer repairs? Better to get that done before stripping.
What are you going to finish it with? If you use a water base you should avoid the steel wool.
_________________________
RPT
PTG Member

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#1296998 - 10/31/09 12:54 AM Re: Re-Finishing With 80 Grit Sandpaper? [Re: Gene Nelson]
Sam Casey Offline
1000 Post Club Member

Registered: 02/05/05
Posts: 1135
Loc: SW Missouri
80 grit will kill your veneer. Do as posted above. ALWAYS sand with the grain in straight lines. Use a flat block and keep your paper clean by slapping the dust out often.


Edited by Sam Casey (10/31/09 12:56 AM)

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#1297043 - 10/31/09 06:02 AM Re: Re-Finishing With 80 Grit Sandpaper? [Re: Sam Casey]
wayne walker Offline
500 Post Club Member

Registered: 08/29/08
Posts: 515
Loc: Windsor,Nova Scotia Canada
80 grit way too course. I used "0" steel wool soaked in stripper or lacquer thinner to clean up the residue. I would give a quick sanding depending on the condition of veneer starting with 120 or 150 and finish with 220. This is enough just to open the wood up for some re-staining to even out the color. If you plan to change the color then more sanding is require to remove more stain color
_________________________
Wayne Walker
Walker's Piano Service
http://www.walkerpiano.ca/

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#1297090 - 10/31/09 08:57 AM Re: Re-Finishing With 80 Grit Sandpaper? [Re: wayne walker]
AUTPHF Offline
Full Member

Registered: 10/20/09
Posts: 55
Thank you all for the replies.

I thought 80 grit was somewhat extreme. I will do as suggested above.


Thanks again

TB

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