So.... Decided to finish the guitar in a satin finish, but only have the poly in gloss, so decided to make my own wipe on poly satin.
The poly is diluted with mineral spirits, which is an american product. Its Aussie counterpart is very hard to find as the research says it could be, white spirits, turpentine, methylated spirits or some sort of enamel thinners.

I decided to experiment and came up with a good alternative.
40% polyurethane satin (or gloss), 30% methylated spirits and 30% turpentine (turps). Using straight turps it takes too long to dry, using straight meths it dries too fast.
This mixture dries fast enough and is thin enough to rag on.

Pics below. I used a floor poly as it goes real hard and is scratch resistant.

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This is 15 mins after poly application, it has just tacked off.