Wolfgang Black diamond Tire Gel was comparable to another brand I have used for years. It is thicker and looks juicier for the tires to "pop". I like the gel. I may switch one day so tires have extra black on them. I have not seen them cleaned more than once with the gel on so it may take another foam cleaning to see how they continue to stick. It only takes a little bit to coat tires.
ProsThe gel is thicker than I am used to but it makes the tires look glossier.
ConsI like my current tire slick and that is because they look more natural. I am sentimental about the brand I usually use. This brand is more expensive.