Quoted from Lonzo:When you fill with an eye dropper do you mean fill and let dry and sand before the next coat or do you mean fill to add clear and then spray the rest of the playfield immediately?
You can fill it and then shoot a layer of clear immediately, but you need to shoot the clear STRAIGHT DOWN over the fill.
If you shoot at any type of an angle, the air pressure will often push the fill out of the hole and leave a "wave" on the playfield. If this happens, sand the wave out with 220 grit (800 would take forever), and fix the depression again latter.
Or just wait for the fill to dry a hour or so, and shoot normally.
If you let the fill dry a few days before you clear, de-gloss it with some sandpaper as the fill is now fully cured, and in need of some tooth to bond with the new layer.