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My friend is getting ready to install teak covering boards and is looking for some guidence.

Best glue --not planning on using any screws

For joints---best way to splice

Any other tips to prevent cracking and curling

We edge glued the covering boards and cut them to a door skin template, we leveled off the old side decking with a thicken vermiculite /epoxy concoction basedon capt Parts post, clamped them in place with NO fasteners ,not even from the underside, and we were done, u will be able to sand these decks for years and never encounter a fastner either from the topside or underneath, this is the way the custom guys in the Carolina's ,Stuart fl , Rybovich , Merritt do there covering boards/transoms /desks/cockpits with teak

Marlin, thanks for your info.

Did you use any spine in the joint? Dowel or biscuit? If yes, what materiial did you use?

No, washed the surface with alcohol, applied epoxy on both pieces, clamped and cut the next day, again, we glued to a flattened surface made ready for the teak

I cut two boards to be joined on table saw thus making a saw blade slot then used a teak spline the entire length all put together with epoxy.