Replies:
1: dont know but would love to find out!
2: depends what you are varnishing over, is it a wood finish, has it been epoxied, or is it a painted finish? If wood, as many coats as it takes to get the finish you require - I used 7 coats on a riva. Over epoxy, probably 2 or 3 coats, over paint, probably 2 or 3 coats again.
As a general indication, its as many as required to get the finish you want.
Ian