Scarf Joints in Plywood

"Lou" wrote in message
ups.com...
I've always wondered about that. When gluing wood together it's always
been a good idea to rough up the area's to be glued so that the glue
goes in the roughend area and has a better grab. If the area is too
smooth it will hold less glue and more possiblity to squeeze out.

Even then, it is the method of preparing the surface that counts.

While you sand, particles of sanding dust are forced "into" the pores of the
wood, thus preventing the glue from being able to wick into the wood, and
increase the surface area being "grabbed" by the glue.

The best prep is either scraping with a sharp blade, or sawing, or
machining, leaving the pores open.
--
Jim in NC