<HTML>In a message dated 8/28/2003 = 2:00:10 PM Pacific Daylight Time, bases-loaded@juno.com writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT= : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj: Re: shellac under varnish Date: 8/28/2003 2:00:10 PM Pacific Daylight Time From: <A HREF="mailto:bases-loaded@juno.com">bases-loaded@juno.com</A></F= ONT> Reply-to: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>= To: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> Sent from the Internet   David    I have typically used shellac for a sealer coat on new boards o= n the top and bottom before the ribs and bridges get glued on. I like the se= aling properties and it keeps  dirt, glue & water from glue cleanup= from impregnating the panel during ribbing. I always sand and then coat wit= h 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.</BLOCKQUOTE><= FONT COLOR="#000040" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY= ="SANSSERIF" FACE="Arial" LANG="0">    &nbs= p;          Dale <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT= : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"> 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<BR= > days, only dewaxed shellac will allow for proper adhesion between the shellac and poly.  Polyurethane is very persnickety about what it adher= es 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<= BR> content found in conventional shellac products would prevent the poly from achieving good adhesion.  That's my take on it, anyway....  W= ith dewaxed shellac, you are safe with any finish I can think of. Mark Potter bases-loaded@juno.com </BLOCKQUOTE> </HTML>