Tung Oil, Mishap

[Paul Chick (Earthlink)]

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 

 

  _____  

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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