Sailing Canoe Chapter 5: Hull Frame Finishing by TimAnderson
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Step 8: Epoxy the deck. Linseed everything else.

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I painted the remaining bare wood of the deck with epoxy.
Epoxy's impervious virtue has its hazards.
Solara came with some rub rails that had lasted 20 years or so. They'd had no finish on them but oil. We painted them with epoxy. They rotted out from the inside in about six months. The moral of the story: Unless you fully encapsulate your wood with epoxy, a partial impervious finish can be like wrapping it in a plastic bag, and it can rot.

So I painted everything else with linseed oil. It repels water and lets the wood breathe enough.
Linseed oil is amazing stuff. It's what Rembrandt and all those other painters made their paint from. It will last forever.
The stuff you get from the hardware store has heavy metals mixed in to make it set up faster.
It's not intended as food so the law doesn't require them to fully disclose the ingredients.
A friend of mine got poisoned by his dad who thought linseed oil from the hardware store was health food. It actually is the same as flax oil, which is a valid modern health craze.
But the heavy metals made his brain a little odd.

 
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