Many thanks for your comments. The use of stringers may be possible because
I am making two cabinets and the stringers could also function as shelf
supports. It seems I have much experimentation to do before I start
construction proper.

Peter.
wrote in message
...
You have a nice project.
If this the end use of these two pieces is to be without any load or
pressure, compression, twisting or extension your idea is suitable.
The use of biscuits will not add any strength but will facilitate
alignment of the two pieces. The use of pipe clams every 18 inches with
moderate pressure should remain on overnight on a flat surface. That is
one clamp under and one on top. Insert wood blocks between the clamp and
the MDF to avoid pressure damages. This construction will be as strong as
the weakest link.
Conversely if you want a stronger construction your butt joint should be
re-enforced with back up supports using hardwood stringers or salvaged
hockey sticks running across the two pieces of MDF. These stingers should
be glued and fastened in pre-drilled pilot holes with metal screws of
appropriate length. You may want to countersink the pilot holes in the
stringers for aesthetic purpose. Even if the MDF is not waterproof I
would use an exterior wood glue like Lepage, Titebond or better.


"PVR" wrote in message
...
I want to butt joint two grain printed boards, one 11.5" wide, one 8" wide
and both 6' long. I'm thinking of using biscuits and water borne glue.

Peter.

wrote in message
...
In order to give a proper answer we need to know what kind of joints you
intend to make.
Is it a butt joint, a scaft joint or a corner joint. Is your work
structural, esthetical or functional.


"B A R R Y" wrote in message
news PVR wrote:
How do I join particle or MDB boards?

Glue and/or screws work well.