The reasoning here is simple. Every color in the visible spectrum can be assigned a number based on a luminosity scale (a scale from light to dark) from 0 to 9 where white is 0 and black is 9. Now suppose that the brown you are trying to cover has a score of 8, and the yellow paint you want to apply has a 4.
Solvent or oil-based paints are used where a tough, durable finish is required for interior and exterior timber, masonry and furniture - although, as mentioned above, the new generation of acrylics and multi-surface paints offers viable alternatives. In general, brushes need to be cleaned with turpentine or white spirit.
HUE-VALUE-INTENSITY. Hue: Without getting too technical, and to put things into laymen's terms, hue is just another word for color. For instance, grass and leaves are two variations of a green hue.
What emotions does it produce?
Masonry paints come in a wide variety of finishes, from textured to ultra-smooth. Opt for a texture if you need to disguise fine surface cracks. If you favour traditional finishes, then consider limewash, which is available from specialists such as Francesca's Lime Wash. The beauty of this paint is that it will mellow and weather with time. However, do check with the supplier first to ensure that the surface is suitable for this finish.
Usually on exposed air ducts of galvanized metal a primer coat of zinc dust-zinc oxide paint is used, before the finish coat is applied.
Do all your own body work . As mentioned earlier, the key to keeping your paint shop costs down is to do as much as possible before you take it to the shop. This includes body work, if you've got the skill, or the patience to learn the skill. Bodywork is time consuming. It requires several steps that must be done in the correct order, with the correct curing times in between. Shortcuts here will show up like a sore thumb in your new paint job, so don't be tempted. If you don't have the skill to tackle the body work yourself then it's smarter to let the paint shop do it. Just understand that this raises the cost of your paint job significantly. Good body work takes hours upon hours and having a professional do it can easily exceed the cost of a cheap paint job.