Tung Oil, Mishap

[John Ross]

No problem with before.
I don't know if they will want to spend the time, for an after. :-(
Thanks for the responses. I guess I was hoping for a stripper, then a couple of passes with the 0000 steel wool.
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
  ----- Original Message ----- 
  From: Paul Chick (Earthlink) 
  To: 'Pianotech List' 
  Sent: Friday, July 13, 2007 10:46 AM
  Subject: RE: Tung Oil, Mishap


  I agree with Mark.  If you choose this way after testing some pieces, follow his advise. Actually, it's very similar to rubbing out lacquers.  Make sure the sanding block you use is FLAT!!! Lay a straight edge from corner to corner diagonally and correct any deviation.  Sand the sand paper surface on a piece of 120 grit with light to moderate "down bearing."  It's quick and can save you from cutting through your finish.  If things go well but you get a few small bare spots, apply a few thin coats of the customer's tung oil the right way.  They should buff out to match perfectly.  Don't allow your sand paper to load with finish nibs. 3-4 strokes can create them.  The paper is cheaper than your time.

  Is there any chance at getting any before and after pictures?

   

  Paul C 

   


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  From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Mark Potter
  Sent: Thursday, July 12, 2007 5:40 PM
  To: Pianotech List
  Subject: Re: Tung Oil, Mishap

   

  John -

   

  Stripping is a HUGE undertaking, and while it certainly may be called for (you can see it, we can't), I would definitely try wet-sanding a piece or two to see if this might level out the finish satisfactorily without spending 100+ hours of work.  Depending on just how rough it is, start with 320-400 to level, then move to 600, then 800.  Finish with 4/O steel wool, all done "wet" (with lubricant), in the direction of the grain.  Suitable lubricants can be 1) water-based: wol-wax, wool lube, murphy's oil soap thinned with water; or 2) solvent based: mineral spirits, naptha, paraffin oil, etc.   If you are incredibly lucky (it happens!), it will look great.  If not, well....

   

  Mark Potter

  John Ross <jrpiano at win.eastlink.ca> wrote:

    Someone had heard that they could refinish their piano with Tung oil.

     

    Instead of using 0000 steel wool, a few times, with a rubout and dry, between coats, which does give a quite nice finish.

     

    They did three coats, but used a brush, and didn't rub out between coats. The result is a thick non smooth finish.

     

    What is the best way out of this, to end up as it should have been?

     

    What can be used as a stripper? 

     

    I was thinking strip, then use the 0000 steel wool, as should have been done initially.

     

    John M. Ross
    Windsor, Nova Scotia, Canada
    jrpiano at win.eastlink.ca

   
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