JailCop
So if one was without airbrush, how would they apply it? And if you don't mix it with another flat clear coat, you can't use it as a finishing coat? Am I reading that right?
Yes, it can be used as a finishing coat. I use it quite a bit on glossy-finish models, like 1950's era jets, or airliners. I spray it directly from my airbrush, with no thinning required. It can be used under flat coats, too, with the flat coat being the final coat for most military models. The reason you want a glossy area for decals is so that the decals lay down/adhere to the model without the clear backing of the decal showing after it has dried. This is known as "silvering" (the clear backing around the edges of the decal looks silvery when this phenomenon occurs), and is seen mainly around the edges of the decal after it has dried. Decals don't stick/adhere well to flat finishes, as the finish is very rough, microscopically speaking. A smooth glossy finish prevents that roughness, and lets the decals lay down well, without the silvering effect. After all of your decals are applied to a model, you can spray a final finish of clear gloss/Future floor polish, or a dull coat, depending on the model. Either one will seal the decals and paint job, and keep the decals from peeling from the model.
Here's another technique that I've seen used with much success, although I haven't used it myself:
1. Determine where your decals need to be on the model.
2. Using a paint brush, the width of which depends on the size of the area the decal will be applied to, dip the brush in the Future/gloss coat of your choice, and GENTLY apply the Future/gloss coat to the area to which the decal will be applied. DO NOT brush it on; rather, kinda place the coating on the spot where the decal is to go (if you brush it on, you run the risk of marring the paint). You'll figure it out once you do the first area. The coated area should be just a hair bigger than the decal itself.
3. Let it dry overnight.
4. Apply the decals normally to the coated spots. Use Micro Sol and/or Micro Set if you wish.
5. Let this dry overnight, at a minimum.
6. Once dry, GENTLY apply a clear coat/Future coat or dull coat to the decal (depends on the finish you're attempting to acheive) with a paint brush (don't brush it on - place it on); OR, airbrush the entire model with a Future coat/clear coat or dull coat, if you wish. This helps protect the decals by keeping them from peeling after the model ages a bit.
Again, I've seen this technique work with other modelers with great success, but I myself have never tried it. You might wanna try it on a scrap piece of plastic first, just to see how it does for you.
Good Luck!!