I chose to use the Scarf Joint which may be a little more involved to make, but creates a board
which is easier to use in construction.
Un-clamp then add extention to table to support the glued up scarf joint.
- - Scarf table extended - -
I clamped 2x4 to the underside of the table to extend it,
then put a couple of strips the same width as the table top to support the scarfed boards level with one another.
- - Scarf joint on the table - -
When using epoxy you must first paint un-thickened epoxy on both surfaces to be in contact
and give it a minute or two to soak into the wood.
Then cover the surface to be joined with a reasonable thickness of thickened epoxy. I used wood flour.
There are many other thickening agents. Use enough to fill any gaps or un-even parts of the joint.
Drive 2 small brad nails (staples might work) through the scarf area to keep the pieces from sliding apart when under pressure.
With all the epoxy in the joint it will become quite slippery.
Remember to lay a generous amount of waxed paper - plastic wrap or other slick surface wrap - both under and over
the total length of the Scarf to prevent epoxy-ing the whole structure to your table.
- - Scarf glued clamped - -
- - scarf clamp detail - -
The lumped up plastic bags in the middle adds pressure to the middle of the scarf where the 2x6 might bend.
Note the waxed paper running under the 2x6 the full width of the scarf.
I actually stacked 2 scarf joints and blued both at the same time - wax paper between the 2 so it will not stick the 2 joints together.
Note that I scarfed only 4 feet on the end of a 4x8 sheet of plywood because I did not need a really long piece.
After the length of plywood sheet is scarfed together and the epoxy cures you can cut out the side or bottom piece as needed.
- - scarfed piece cut out - - ready to attach to the boat or attach to another panel using the stitch and glue method.
The easiest joint to make is the butt joint which simply attaches the pieces square end on and reinforcing the connection with a strip (to go on the inside) attached (glued) on one side of the joint.
A variation on the Butt joint is the Fiberglass-Epoxy Butt Joint
Glen-L has descriptions of plywood joints
update - 5 December 2017 - 10 December 2017 -
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