ok.. words from the insider here.
The 3M branded paint is manufactured in the K&H plant, and is the same K&H paint as sold in any other paint retailer. An exclusive deal has been done with Supercheap to sell under the 3M name for a specified period of time. 3M bought all store stock of Septone paint, not the Septone company (they will probably crush the Septone stock). The Septone company
is still Australian owned and made, and still trading strong. Cleaning products and industrial chemicals are their main business, and the lost of a large retail market is no huge loss for them. Check their website to locate a supplier if which to still shop Australian for paints.
The 'Motospray' paint as used to be carried by supercheap is in fact the exact same paint now carried under the 'Australian Export' brand. The brands 'Motospray', 'Export', 'Series 500'and others are all logos the MMP Industrial company
manufactures under. The buyer (in this case, Supercheap) specifies what 'brand' they want the can to say. They will also manufacture under custom brands, which is what Autobarn and Auto-One do with their 'own' brands of paint.