On which surfaces should I use casein paints?

To spray paint your ATV frame matte black, you will need the following materials:

• Matt black spray paint specifically designed for use on metal surfaces
• A clean, well-ventilated workspace
• Masking tape and newspaper or plastic sheeting to cover any parts of the ATV you do not want to paint
• Primer specifically designed for use on metal surfaces
• A paint respirator to protect your lungs from inhaling fumes
• A spray gun or spray can
• Sandpaper or a wire brush to prepare the surface of the frame

Before you begin, it's important to properly prepare the surface of the frame by cleaning it thoroughly and removing any rust or old paint. Use sandpaper or a wire brush to remove any loose paint or rust. Once the frame is clean and dry, apply a coat of primer specifically designed for metal surfaces. This will help the paint adhere better and ensure a smooth finish.
Allow the primer to dry completely before applying the first coat of matte black spray paint. Hold the spray gun or can about 8-10 inches away from the surface and apply the paint in thin, even coats. Allow each coat to dry completely before applying the next. Once the final coat is dry, you can remove the masking tape and newspaper or plastic sheeting and reassemble the ATV.

Did you do anything to prep the furniture before you painted it? Bubbles usually form because there was something on the painted surface that is giving off gas of some sort, possibly through some chemical reaction to something in the paint. Did you use a chemical to clean it or maybe didn't clean the painted surface before you painted it? It is possible that if you used a cleaner and didn't get the cleaner off the furniture before you painted it this is causing the bubbling. Either that or there was something on the surface that you didn't clean off before you painted it. The only way to get the bubbles out is to sand them out. Use a power sander with a fine sand paper and make sure you wipe the surface down with a wet cloth and let it dry before you paint it again.

Yes, you can. It states that you should use a primer first on bare wood surfaces. Other than that, the only restrictions you would have is ensuring that the paint type itself is compatible with the paint that is already on the surface. Some latex and oil-based products don't play well together.....

Sand it down and repaint surface, or use a little gasoline on a rag and gentally rub the scorched surface withought taking off the paint, be sure its not a fire hazzard first

you might be able to buff it.

automotive paints require a good clean and well prepared surface like light waterpaper sanding to remove any oily or fatty resedu and the correct undercoat before applying a new coatings otherwise it will not last chipping or peeling will occur.

Casein paints come in bright colors and they dry fast. They are also water-soluble. If you touch them you will see that casein paints are very glue-like in their consistency.

That depends on what type of paint you are using, surface to be painted, and air pressure for the gun.
Some type of paint needs different air pressure.
This is something you will learn by practicing. Try mixing a little of paint with some thinner
and spray using different distances from the surface to be painted.
If paint is not getting well distributed on the surface then try adding some more thinner.

I would sand the entire surface before painting anything. Be sure to clean surface after sanding so not to get debris in paint (bumps). Stainless is hard so you may have to start with heavy grit sandpaper and work you way to a fine grit. Personally, I prefer sandblasting on metal surfaces, but I tend to like a flawless finish when I paint. Never the less, paint needs something to adhere to. Stainless is polished most usually so nothing will stick to it (hence the name stainless) by sanding it you create grooves in the surface for the paint to hold on to.