I’ve been doing some research on the Tamiya acrylic clears and just wanted to see if I have this right or am missing anything else.
X-21 - added to gloss paint to dull down its shine
XF-86,22,35 - Used as a final coat to seal everything.
Additionally, are these just Tamiya paints (86,22,35) without the pigment added to them so basically just the binder and solvent? Can they be used as a medium to make colours a bit more translucent?
Stay away from using X-21. They’re nothing but garbage and not worth the trouble using them unless you’re looking to ruin a perfectly nice kit. Not worth adding it to gloss paint when there are flat paints available; hence the letters XF before the number.
XF-22 is RLM Grey is an opaque paint that has plenty of pigment. Not sure how it fits here.
XF-86 is a flat clear for a final coat to seal the model. No color, but the chemistry of the sealer causes it to dry to a non-reflective finish. XF-35 is also colorless, but dries to a semi-gloss finish which is slightly smoother and more reflective than flat. The X-22 is the gloss version, which makes things very smooth, shiny, and reflective.
You can mix Tamiya’s paints to tint the clears to achieve different layers with translucency, but that requires a bit of experimenting to keep a balance of paint, clear, and thinner to get it right. You’ll see a lot of old school armor modellers using Tamiya’s buff with XF-86 to get dust effects and such. It can be an effective technique.
I read somewhere that Tamiya clear gloss acrylic thinned with Mr. Color Leveling Thinner will lay down a glass smooth gloss shine. I have to try that one day.