[CAUT] Hamburg Steinway Hammer Voicing (Up)

[Ward & Probst, Inc]

Sanding sealer is lacquer or varnish with mineral soap (zinc stearate) added
to help powder the finish when sanded. It's generally less brittle than
lacquer or varnish alone when used on wood. Haven't tried it on hammers but
I may.
DP
Dale Probst RPT
Registered Piano Technician
Ward & Probst, Inc.
www.wardprobst.com
dale at wardprobst.com
 


-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Fred
Sturm
Sent: Tuesday, July 27, 2010 8:01 PM
To: caut at ptg.org
Subject: Re: [CAUT] Hamburg Steinway Hammer Voicing (Up)


On Jul 27, 2010, at 8:14 AM, Wiliam Ballard wrote:

> The salient feature is probably the flexibility of the resin. (Who
> wants a felt fiber coated with something rigid and brittle?) Ed's  
> suggestion of sanding sealer lacquer probably is the closest we'll  
> get to this. The top-coat lacquers have been formulated for the  
> performance on the film under rubbing and polishing by finishers,  
> with no interest in hop it performs in reinforcing felt piano hammers.
>
	What is sanding sealer? My understanding is that it is simply
lacquer  
with some kind of fine filler material added, to make it easier to  
sand (doesn't load the paper as much, allows for dry sanding, can  
remove a lot of material fast to get a smooth surface). So I have  
assumed that it is really the same stuff, but with an inert material  
added, like that filler stuff West Systems sells for use with epoxy.  
The "inert dust" changes the way the lacquer sands, or so I have  
thought. ANyone know different?
	I don't think sanding sealer is less brittle and more flexible than

lacquer. I would think the opposite if anything - more flex would mean  
more likelihood of gumming up sandpaper, and it doesn't. When it  
dries, in hammers, I think it is more likely to "break" because of  
discontinuity caused by the dust. That is how I have pictured it. If  
anyone has different information, I'd like to hear it.
	
Regards,
Fred Sturm
fssturm at unm.edu
http://www.cdbaby.com/Artist/FredSturm