If you're interested in Collinite...
From what I've read
for auto's it's 476(s), 915, and 845. All seem to work well from what I've read on applying them to gel-coat.
However, from my reading on
boats, Collinite 885 Fleetwax paste sticks out above them all. NOTE: I haven't confirmed this myself, but here's a link to the boat wax (note the durability of 885):
http://www.collinite.com/assets/Uploads/docs/marineprodselectguide.pdf
Automotive wax:
http://www.collinite.com/assets/Uploads/docs/marineprodselectguide.pdf
Note that 476(s) and 885 have the same durability as listed by the company.
From the FAQ page (pay particular attention to questions #10 & #11):
FAQs » Collinite
Duragloss Marine products are highly regarded, as are most of their products.