I'm no painting expert but I've had fairly good results over the years by getting more patient. You don't say if you brushed or sprayed. Both have consequences. Sanding with increasingly fine sandpaper produces the best results. Then making sure to get 100% of the dust off prior to priming. Tack cloth works best for that. Light multiple coats of paint with super fine steel wool sanding in between coats (again using the tack cloth each time befor the next coat).
Painting inside the house, like your garage, keeps blowing dust to a minimum but you have fumes to contend with. Outside allows less fumes but more lowing dust.
Bubbling, IMO, means too much paint at once, or some bad paint or surface prep, or painting too quickly between coats.
Most of my mistakes have happened by getting a nice light coat of paint applied, and then screwing it up by thinking it could "use just a bit more on this coat..." Patience grasshopper
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