In article ,
Duane Bozarth wrote:

Larry Bud wrote:
...
Are you being sarcastic? You glue up with a biscuit, the glue swells
the biscuit, you sand, the glue on the biscuit dries, the biscuit
shrinks, a depression is formed where you sanded.

I know folks keep saying that, but I've never been able to observe it...

Maybe because I work slowly enough owing to other constraints that by
the time I get from initial construction to finishing things have dried
already or (more likely) the thickness of the piece is sufficient as to
make the differential exapnsion unobservable w/o more precise
measurement than I'm ever going to make on a wooden surface....

I have never noticed it either and I have used one sh*itload of biscuits
in my day. Mostly edge-to-edge joining of panels, counter tops etc.
Never seen it. But, like in your case, plenty of time passes from
initial assembly to finish.
I also don't have a polarizegraphospectroscopometer like Norm either.

0?0
?

Rob