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Mark _australia said..
But be aware a SUP is not ideal as whilst it has plenty of float is has bugger all lateral resistance - a proper learner board with a centreboard (daggerboard, or "keel thing") is 100 times better.
+1
Some SUP boards (like the starboard Atlas) have additional centre fins to assist with learning to windsurf.
Wihtout something to improve lateral resistance, the effort of installing a mast foot could be a complete waste of time.
Clarence