Vertical lasts different than horizontal...
And uncovered horizontal was made from woods that were naturally resistant to rot and splinter... generally either through natural inhibitors or tight grains.
You can still do that if you use these types of wood.
Other items, such as white pine from NH was older growth - grew more slowly - and had tighter grain. They would be coated man times with a polywhey produce that came from the milking industry as a waste product to making cheese or as spoiled milk that could not be sold.
This is the basis for Vermont Natural Coatings' products.
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