A few people comment on how they dislike the finger-joint (puzzle piece ) look of the cabinet. I can understand where they are coming from. This design is crucial for a rigid and tough construction, but it does not juristic the final look. I spent the last 5 days pulling all the stops to show you how to properly sand, fill, and paint the cabinet to achieve the seamless look.
I normally stain/seal my cabinets; I prefer the natural wood look (it's also less labor intensive). However, it's time to lead by example. Besides, if you want a theme cabinet (Donkey Kong, Pac Man...) you need to paint.
Follow the directions for your primer of choice. I painted on three coats of primer allowing it the dry properly between each coat. This will build up a thickness that we can sand down, removing and filling any gaps and surface inconsistancies. Be abosultely sure to allow the last coat of primer to dry thoroughly before final sanding. I am using Kilz Latex 2. Kilz because it's what I consider "quality" and it goes on thick. Latex based becaused it is water-based so easy cleanup and low odor.
This Kilz #2 latex primer is rather thick. It is latex based so you can thin it with water to improve leveling (lessing brush markings). Recently I have been adding Floetrol (a paint conditioner) and thining this paint with water only slightly to use this primer with a foam brush. The Floetrol keeps the paint wet longer with helps the leveling process. YMMV.
Bust out your sander again, this time with 120 grit and sand away the brush strokes. After that switch to 220 grit and sand the rest by hand. Keep a consistant sanding path to avoid scratches. Wipe all dust away with a dry cloth. Be sure all dust is removed. The seams should be hidden at this point. If they are not; repeat sanding and priming.
I use a quality spray paint for the final coats. I prefer spray paint as with a steady hand and ideal painting conditions (temp + humidity + no wind) I am happy with the results.
Following the directions of the paint I used, I did two coats and allowed the paint to dry 24 hours. Then I did a final touch up with my 220 (500 is better) grit all over. Removed all dust, and did two more coats; allowing the last coat 24+ hours to dry before handling. I brought the cabinet out into natural sunlight (on a sunny day) and visually inspected it. I noticed some glossy areas and some flat areas. I decided to do one last coat to even the gloss tones. I let this dry 24 hours.
Color used is Candy Apple Red Gloss
Final thoughts: You can use a spray can primer, but it will take 2-3x more coats to build the same layers as can paint.
Take your time and be patient! Love the paint, be the paint.