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Are you painting a model kit in plastic/composite type material or are you trying to put the primer on metal? I use etching primer on Aluminum and it does work if mixed correctly.Here is a valid question. How may of you use etching primers and how many just sprays it straight from the bottle?
Very good information Wojtek, thank you very much.Luis .. I think PTW means a similar kind of paint that are used for priming models before applying of camo colours or the metalic coats. Of course, it is possible to use a such coat for the PE parts too. Long time ago when the acrylic water colours were started to be used they peeled off quite easy. So it was suggested priming the PE parts too. However these contemporary paints are of much better quality so the priming isn't needed often. What is more the pre-painted parts are offered as well. Additionally the priming makes parts of more "thick" appearance. Anyway if somebody wants to prime the PE parts I would suggest using of any a light grey oil enamel like Humbrol for instance. The kind of colours sticks to the PE parts well and allows to apply the acrylic paints over that without any trouble. In addition this helps the paints stick better to the surface limiting the posibility of the peeling off. Unfortunately the oil enamels smell a lot to many people so I may recommend the Tamiya Fine SurfacePrimer (light grey or white) or Gunze Mr. Metal Primer that is clear.
What I mean by etching primer is a primer that actually does a chemical bond with the plastic underneith making it hard to remove by peeling tape or scratches. Most lacquers and enamels have an etching effect. I am looking for an acrylic primer that uses the same process. Vallejo Surface prep and Stynylkrez work well but do not actually " etch " the surface and they seriously clog the t9ips on my air brushes This is causing me to change paints because the urethane based paints like Valejo do clog quickly and in some instances are harder to clean, at least for me. Gunze Aqueous and Tamiya acrylic lacquers tend to work better out of my brushes and are easier to clean up with isopropyl alcohol
Your observation is interesting, PTW ... currently I'm practically working with Vallejo and Tamiya, I still do not consider it difficult to apply the spray and struggle more than usual in cleaning my airbrush with Vallejo paints. Now I'm using Vallejo's primers and everything is going well. Thanks for touching the topic.
Saludos