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Welcome to the Bunnings Workshop community @michael183. It's a pleasure to have you join us, and many thanks for your question.
Was there a particular product you had in mind? Products like 70mm x 19mm x 1.8m Pre Oiled Merbau Picket Blanks come pre-oiled and, due to the penetrative nature of the oil, it will prevent the effective uptake of paints.
Un-coated Merbau can be painted, but it would be worth either letting it weather naturally or doing a new timber prep on it. It would also be a good idea to use Rust-Oleum Zinsser 3.78L Bulls Eye Primer Undercoat Sealer and Stain Blocker. Merbau has a lot of natural pigments and tannins in it, which will bleed through lighter paint colours if you don't block them.
If you can let us know more specific details on the Merbau you wish to paint, I can provide further instructions on how to go about it.
Please let me know if you have any questions.
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