shellac under varnish

[gordon stelter]

Yeah! But what about 50 years from now? 75?
     Thump

--- David Love <davidlovepianos@earthlink.net> wrote:
> I've always used shellac under varnish and never had
> a problem.  I like it
> for a variety of reasons not the least of which it
> provides a nice surface
> for rub-on soundboard decals.  I use flake dewaxed
> blond shellac and mix it
> myself.  The canned stuff on the shelf is often
> pretty old by the time you
> buy it and it only has a life of 3 years.  The main
> reason I brought it up
> was that every time I open a can of varnish I can't
> help but see on the
> label where it says "Do not use over shellac".  Well
> I've ignored it for
> this long, but I thought I'd ask just in case there
> was something there.  
> 
> David Love
> davidlovepianos@earthlink.net
> 
> 
> ----- Original Message ----- 
> From: 
> To: pianotech@ptg.org
> Sent: 8/28/2003 9:27:10 PM 
> Subject: Re: shellac under varnish
> 
> 
> In a message dated 8/28/2003 2:00:10 PM Pacific
> Daylight Time,
> bases-loaded@juno.com writes:
> 
> 
> Subj: Re: shellac under varnish 
> Date: 8/28/2003 2:00:10 PM Pacific Daylight Time
> From: bases-loaded@juno.com
> Reply-to: pianotech@ptg.org
> To: pianotech@ptg.org
> Sent from the Internet 
>   David
>    I have typically used shellac for a sealer coat
> on new boards on the top
> and bottom before the ribs and bridges get glued on.
> I like the sealing
> properties and it keeps  dirt, glue & water from
> glue cleanup from
> impregnating the panel during ribbing. I always sand
> and then coat with
> nitro cell. products. No problems here as to
> adhesions. I use one good wet
> coat of the bullseye in a can, ooooohh I can hear
> the cringing from hear. I
> spray it on. I quit using varnish over shellac after
> I lost several finish
> jobs to the crinkles& varnish is tooo slow to cure
> for my schedule. What
> can I say I'm varnish impaired. Love the smell
> though.
> 
> 
>               Dale
> 
> 
> 
> Hi David -
> 
> Shellac is actually an excellent choice for a sealer
> coat under
> "traditional" varnishes, but under the more modern
> Polyurethane
> varnishes, which seem to comprise the majority of
> the product lines these
> days, only dewaxed shellac will allow for proper
> adhesion between the
> shellac and poly.  Polyurethane is very persnickety
> about what it adheres
> to, to the point where it really doesn't even adhere
> to itself that well
> unless proper techniques are employed.  And
> certainly, the natural wax
> content found in conventional shellac products would
> prevent the poly
> from achieving good adhesion.  That's my take on it,
> anyway....  With
> dewaxed shellac, you are safe with any finish I can
> think of.
> 
> Mark Potter
> bases-loaded@juno.com
> 
> 
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