In article ,
GerryG wrote:

No, you have both. The shellac will bond very tightly to the particle board,
and that bond will be stronger than the material itself. Contact cement,
unlike wood glue, is _not_ designed to bond a porous surface, at least not
with its full strength.
GerryG

That would be the point of thinning the CCement, Gerry. To allow the
cement to soak into the porous surface creating serious adhesion.

Try it on a test piece. The particle board will fail lonf before the
glue joint. I'm not so sure of that happening with shellac... but that
is just a hunch.

The question here has become; how strong is the bond between ccement and
shellac. I don't have an answer for that.

0?0

Rob