VERGE

You can purchase online here: https://smitsgroup.co.nz/products/5615/masking-tapes-other-tapes this might be the one you want: https://smitsgroup.co.nz/product/84207/jtape-flat-orange-masking-tape-6mm-x-50m Plane looks great; wish i had that level of craftsmanship.

Go to an automotive refinishing place and get the yellow tape (Japanese i think) it has a very low profile and is great for masking where you dont want to see a thick line where the paint types change. Perfect match paints used to stock it. Have you tried Wairau paints? Not sure where you would get it outside of Auckland sorry

ANZOR also stock Tefgel. Not sure that they're cheaper than a marine store though