This is how I learned to blend decals with top coats. Really good video and how-to make the edges of decals disappear. I would recommend wet sanding, one can also practice just sanding the very edges of the decals and not the whole thing but that will take practice. Another way to make this easier is to cut off as much of the clear edge of the decals, and then going through this whole process, however really good eyesight is needed for this. And yes, lacquers are by far the best paints to airbrush, and as you did, wait for 48 hours-minimum before repeating the next layers of clear, and for those that want a matt finish, just airbrush the very last layer matt (flat coat).
Whoa, this is weird. I recognized the pieces in the little preview clip youtube does from your post on r/gunpla. I hadn't opened the comments there to see you made a tutorial vid. Well, time to watch, lol.
Loved the visuals. Very helpful tutorial. Soooo much extra work to achieve that finish. I always wondered how some people got them so perfectly integrated.