I thought IPE had alot of oil in it? If so that doesn't mis well with a urethane or poly type sealer that won't let it breathe.
Take that with a grain of salt just giving you somethoing to research for lack of any other answers.
Ipe isn't usually finished at all. It doesn't need a finish. You could use Messmers Deck Finish, which may help retain some of the color. If anything a very light (thinned) pure oil like for teak could also be used. Ipe isn't very porous.
I've built a number of Ipe decks, and always used Seasonite. It's a sealer and helps keep the color. But, like all these outdoor wood sealers, you'll need to renew it yearly. It was recommended by the lumber yard I buy the wood from. It's not sticky or gummy, and pretty much soaks in. I don't have a jug in front of me so I can't tell you who makes it.
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