Citadel Evil Sunz Scarlet Layer Paint is designed to be multi-layered. This red color is slightly transparent, so you can use it to build your color over several layers until you're happy with it. Now the paint does require a bit of practice to use, but the results are well worth it.
The layer paints are best used as a 2-step highlight, so two paints for each color but this is a guideline. For example, Evil Sunz Scarlet can be combined with Wild Rider Red. You start with the darker of the two and apply it to the surfaces that you want to finish with this red color.
Because the paint is a bit transparent you will continue to see the base color a bit, but by using Evil Sunz Scarlet together with Wild Rider Red you can use that transparency to apply the layers. If you apply the lightest color after the darkest color in maybe 1 or two layers, the last highlight of the lightest color will ensure that you have a great result.
The color of Citadel Evil Sunz Scarlet (22-05) is similar to: The Army Painter Pure Red (WP1104); Old Citadel Blood Red; Vallejo Game Color Bloody Red (72010); Vallejo Model Color Vermillion (70909); Instar Burnt Red; Rackham Rackham Red (36); Reaper Master Clear Red (9094); Coat D'arms Blood Red (104); Scale75 Antares Red.