Prime Prime Prime!

And remember to wash all your pieces with a good antigrease soap. This will remove the oils that were used when your sprues were manufactured. After all, oil and water (acrylic) do not mix.

I've heard of so many people pulling their hairs off because they can't figure out why, even though they prime a piece, it starts to chip off, well, its due the oils.

You won't lose any details while priming on your model, ECH had once told me that Vallejo Primers kinda grab into the figure as it dries out, and after trying it, it indeed does. I swear now by it!

Primer doesn't only help paint to adhere to the pieces but also aids on the color concentration of the paint, this mean that in stead of needing a bunch of layers to get a true color, you will require much much less layers. This not only saves money and time, but also preserves details on your pieces due to a minimal layer composition.

Luis