I'm certainly not going to argue with westend but I do this stuff too and I found that holes like this usually have whiskers and they are hard to get rid of and that little tiny holes are a pain to fill. My solution has been to make the surface smooth and make the hole conical in shape. I use very good and very sharp carbide countersinks. High end woodworking tools are a little, ok a lot more expensive but they do a better job. I have used step drills in drywall repairs and they work well too.
If you only fill holes occasionally filling and sanding over and over until you get a smooth surface is fine but the Luan is probably vinyl covered and that surface doesn't sand well.
The resin based material is best and applying using good knives, a smooth surface is easy to get. I even use pallet knives from an art store for small applications, they are very flexible.
