Things to try a

1. Thin the finish more. It seems counter intuitive that thinner would
fill better but the thinner might have a different surface tension
character.

2. Thin with something different, ie if you can thin with thinner or
spirits, then try the other one. Same surface tension thing. I've
heard of adding soap or some other things in water based finishes to
reduce tension. Note sure if there is a varnish equivelant.

3. If you just have a few gaps here and there you can try filling the
gaps with slivers of wood. Just tamp in some toothpicks, etc.

Finally, from the repair problems I've had I believe that if you cant
quickly find an acceptable mid-finish repair, then sand it off and
start completly over, filling the gaps with some appropriate medium
first.




Ed Bailen wrote in message . ..
When #1 nephew built his new house, he bought 1/2 of the floor from a
gym that was being torn down. In exchange for spending a month of
weekends cutting staples off the old maple flooring, the rest of the
family has unlimited access to the maple left over after he finished
the house. There is a LOT of left over maple flooring.

Over the past few years, I've made a number of tables and benches out
of the stuff, but the last two projects have me stumped. I'm making
two desk tops for our computers. The wife's desk top is assembled
from .75 x 1.75 planks joined on the .75" edge. My desk top has the
planks joined on the 1.75" edge. On both tops, there are areas where
the boards did not meet entirelely flat, and there are some gaps that
are less than 1/64" wide. Most of the gaps filled with varnish, but
some appear to have some sort of surface tension problem. The varnish
beads up at the edges of the crack and refuses to penetrate or bridge.
I've tried a wiping varnish and a brush-on varnish.

In preparing the boards for assembly, the top side of the plank was
run through the planer to remove the finish, and the remainder of the
planing was done on the bottom side to remove the grooves. The sides
of the planks were planed only to the point where the tongue and the
groove were removed. I could surmise that there was some remnant of
the original gym floor finish or wax that was causing the problems
with the face-jointed desktop, but that doesn't seem to cover the
problems with the edge-jointed one.

Since everything is all glued up, I guess I'm more in need of a
solution than an explanation. Does anyone have any suggestions?

Thanks,
Ed Bailen