You'll have to work it around the surface but it will take it off. It may take a few applications. The tamiya paints are fine but the andrea paints are better. For figure work and smooth finishes, don't try and paint it with one coat. Mix the andrea down about 2:1 or 3:1 water to paint. (used distilled water if you have hard tap water) It will look like a heavy wash after the first application but the second or even third application will smooth it out and give you an even surface. You can use heavier coats(2:1) for these successive applications of paint. Ive found you can treat tamiya paints like andrea the same way. Tamiya's dryng agent works a little faster so a thinner paint mix works well.
You can make green with some yelow and blue. Red will make it more olive and black will make it a little more like hunter or forest green. By varying levels of blue, green or even white (for a softer or pastel shade) you can give yourself several shades and tones of green. Play with the mix off on the side to get what you think you'll like. (All colors are made up of the primary colors blue, red and yellow. By adding things like black or white you can change opacity and tone. My advice is pick up a color wheel or make a copy from one of the many modeling publications that include them within their text. From it you can mix up complimentary and contrasting colors for any color you want, just by mixing those colors. It will also give you more effective highlights and shadows. i.e. to highlight red and avoid it going pink, use yellow instead of white. To shadow red use blue. Shep Paines books on dioramas has one and many of the figure books have one. Almost any art book will have one printed. I keep one taped up over my workbench for those late night sessions when my brain goes numb and I can't think.
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The difference between gloss piant and flat paint is the amount of pigmentation:carrier. There is more particulate matter in flat paint causeing it to refract the light and break the light up on the surface of the paint. Gloss paint has more carrier or solution. This is what rises to the surface and forces light to reflect off the pigment, creating a gloss finish. By mixing the two, dependent on the mixing ratios, you can create everything from a slightly dull gloss to a slight matte sheen to paint surface. Later when you feel more comfortable you can play with mixing in flow enhancers and airbrush mediums to give your acrylic paints characteristics more similar to enamels or oils in their working chacteristics. But I advise you sit down and spend a couple of days experimenting before tackling a figure with these. You should know the results of your mixing ratios to determine the finish you are looking for.
Always try to paint in long even strokes and try to avoid going back over the previous stroke if possible. You can actually pull pignemt or paint away the surface by doing so because of the drying agents working with the air. A round is good for this base coating.
Steel wool is just that and you must be careful when using it. You can soften crisp detail by going too far. I have a nylon brush that I use on my dremel that I lightly and gently work softened paint finish off of surfaces. For a broader area you can use a toothbrush. It is much more gentler on metal surfaces, especially since figure mfr.s use a tin/pewter and bizmuth mix in their figures making them relatively soft metals. If you want to use steel wool you can, but use the finest you can get a hold of and go gently. Don't be in a rush. I've found that patiently working the paint with a stiff paintbrush and thinner appropriate to the paint is sufficient to remove paint down to the enamel primer coat and I can start over. The layers aren't all that thick and 15 or 20 minutes working it can clean it up and salvage an figure I've spent several hours on in prep, base coats and details. If you are going to remove the paint on the cape with steel wool, you should finish up with a lengthwise rubbing to remove or smooth out any scratches that are perpendicular to the "flow" for the cape.
Hope this helps and I'm looking forward to your finished piece.
Regards
Mike
"Imagination is the dye that colors our lives"
Marcus Aurellius
A good friend will come and bail you out of jail...but, a true friend will be sitting next to you saying, "Damn...that was fun!"