Flush jointing blue board like plasterboard ?

I've searched this forum but haven't quite found an answer. If I clad an external wall with blueboard (Hardie Tex or the like), can I flush joint where the recessed edges meet? ie: the same way as paper tape and base coat on plasterboard? James Hardie site says that their wet area base coat is not approved for external cladding.

I preferably want to be able to sand the join so the whole area of sheeting can just be painted - no render or textured finish.


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