How to prep gutters for weatherstrip/glass installation

Should I even bother with the self etching and sealer? Or should I just do the epoxy prime and paint? Only reason I'm asking is I was hoping to be able to use something out of a rattle can as I have such a small shop to work in. The car will be going out a relatives paint shop to get sprayed when the time comes, but I was hoping to just do what I had to do to get the glass in without removing th car from my garage....

Thanks