The difference is quality and p r i c e M66 costing much more. Here it is, from the catalog:
"M66 is a long lasting Self-polishing Co-polymer that is formulated with copper acrylate co-polymer resin and Biolux technology for use below the waterline on fiberglass, wood and primed metal boat hulls and parts in salt and brackish water." (4L $349)
"MExtra optimum performance antifouling. High copper content, self polishing technology ablates slowly over time. Re-coats most existing anti-fouling with normal surface preparation." (4L $219; 10L $499)
I also use MUltra (harder no ablating) on the prop-shaft and the leading edges of the hull.
I use MExtra with success.
Also, about the food. Certainly, Customs has very strict rules as we do not want diseases what we do not have here get in, but canned food pre-packed, freeze-dried food items should not be a problem l guess. I am not sure, though! Check with Customs or Quarantine! before arrival!
They are definitely touchy about fresh food, animal products, plants, fruit. Fines apply too! Declare everything, absolutely everything, you can not go wrong.
Also, clean the inside but do not toss the rubbish over the side! Declare it too!
How do you go with the inflatable?