Problems seem to jump out of nowhere

Had to repaint the Oil Can and the Side tin. It seems that the paint didn't gel together so when sanding it down a little I noticed a small spot and the small spot turned into a peel and the peel turned into me taking all the paint off back to the primer. Reprimed the Oil Can and Side tin again and got the first coat on for the base color. Now its moving on to waiting for the base to dry and working on the rear fender mounts and adjusting the solo seat mount. seems like the things to do are never done.