A company wants me to make a teak sink. Simple design, rectangular and 5" tall. I was thinking of making box joints and using West System epoxy to put it together. But what about the bottom? It is going to be about 19" from front to back. Do I have to worry about expansion and contraction? Or is teak stable enough to just glue to it? It will be covered in a few layers of West System epoxy and then marine varnish. Unless someone tells me different, maybe teak oil.
(Architectural Woodworking Forum)
From contributor A:
Box joints sound good to me. Simple, attractive, easy to machine, plenty of bonding surface.
I would coat the entire sink inside and out with epoxy. Let it cure overnight. Then wash the amine blush off with diluted Simple Green. Sand the epoxy down on the inside and put on a second coat. Let it cure for a minimum of 7 days. Repeat the cleaning and sanding. The epoxy is still curing in that 7 day period. Oil based products will not cure on a surface contaminated with amine blush. You can see this in drawers that have been glued together with epoxy. No one ever cleans the corners well enough. The poly or varnish will stay gummy in the corners for years. Yes, we learned this by fire. Don't get burned yourself. We switched to MAS epoxy because it doesn't have the amine blush problem. Then coat the epoxy with a 2K product such as Bristol Finish, Eurobild, Awlspar, or even an automotive clear coat. Gougon Brothers had a catalyzed varnish. You need a much more durable surface than marine varnish. Sounds like a fun project.