Nest came the rub down with tack cloths and a good shop vacuum to remove all traces of paint dust. Once all the dust is removed you may apply a good coat of primer. Make sure it is as even a coat as you can make it. If you are using spray cans, buy a spray can handle. Your fingers will not be able to depress the button long enough and as your hands tire, the paint layers get thinner and more uneven. Apply a good coat over the entire boat inside and out. The primer will expose and surface damages to the metal below as well as any holes in the metal shell which need to be patched. Runs in the paint or primer will be easy to see and although it will not effect the boats use, the final appearance will be effected. Now is the time to sand these defects out and re-prime those areas.