I think you should be able to get by with spar urethane. I lopped off a limb of a tree the other day and coated it with spar urethane and it sealed it right up. It was a mesquite tree and I wanted to see how it'd work. Worked great. You might try contacting Mike Westvang and getting his opinion. I think some of the exotics are oilier than others and aren't compatible with certain sealers/finishes...
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