Instructor or not you still need 50 hrs before you can instruct on floats. But the whole float rating process in Canada is a joke. There is no flight test so there is no independant verification that the student has learned anything and the knowledge and skill requirements are far too low, for both the instructor and the student. In a perfect world the instructor would have to have significant real world experience (IMO at least 500hrs of line flying in a commercial operations) and have to receive training on instructional technique and have developed an effective curriculum.
Never the less, there are some very highly experienced and very able seaplane instructors working in Canada so I am always amazed at the fact students willingly take instruction from somebody with no practical experience when there are better options available if only they had done some homework. But then in general it seems many students put more effort into picking their mobile phone plan than picking a flying school
