Not sure what your definition of "natural stain and finish" is, but a coat of BLO will bring out the grain of the maple (not sure how it will affect the bubinga) and then top coat it with 1 of two things: either a true marine spar varnish, or untinted exterior oil based paint . If the boards aren't left out either may be overkill, and just a very good quality varnish might do just as well. Now, "quality" varnish means everything but those formulas with urethane resins ("poly"). Urethanes do bad stuff when exposed to UV, even for short time periods, so almost anything the big box stores sell is out. Non poly finishes include Pratt and Lambert 38 (alkyd resin/soya oil formula, very light in color, almost no amber), SW Fast Dry Oil varnish (alkyd resin/linseed oil formula), or Waterlox original (phenolic resin/tung oil formula, and very dark in color). Using one of these varnishes would negate the effect of the BLO, so you can skip it with them (they will do the grain appearance thing). But you could also use a waterborbe like GF HP, or a waterborne exterior paint (100% acrylic) like Olympic Icon exterior (base #5, no tint) or comparable products. They dry water clear, so the coloring from the BLO would be a good thing. Just my opinion
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