I went out a bought an Ingersol Rand aircraft riveter. I own 5 aluminum boats and have always owned aluminum boats so it only made sense to have the right tool. Its basically an air hammer with a real short stroke with a set of custom cut drivers and a set of hand held anvils. The driving bits are concave to fit and form the rivet as it compresses giving a perfect factory appearance.
I think mine is an AV-13, they make several size guns, the longer the barrel the larger the rivet it will buck.
http://www.clearairtools.web.aplus....creen=CTGY&Store_Code=CAT&Category_Code=RG-IR